There’s chocolate cake, and then there’s Hershey Bar Cake. This isn’t just any dessert; it’s a celebration in a pan, a nostalgic hug for your taste buds that combines the deep, familiar flavor of Hershey’s cocoa with the creamy sweetness of chopped milk chocolate bars. I’ve made countless chocolate cakes in professional kitchens, but this one, with its foolproof method and spectacularly moist crumb, is the one I turn to for birthdays, potlucks, and those “I need chocolate now” moments.
The result is a towering, tender cake so rich it almost melts on your tongue, draped in a frosting that tastes like a whipped chocolate bar. Let’s bake some happiness.
This cake earns its place in your recipe box for so many reasons. After testing it multiple times, here’s what makes it truly special:
- Unbeatable Moisture: The secret is boiling water in the batter. It blooms the cocoa powder and creates an incredibly tender, moist crumb that stays soft for days.
- Double Chocolate Impact: We’re using Hershey’s cocoa and chopped Hershey’s milk chocolate bars. You get deep chocolate flavor from the cocoa and sweet, creamy pockets from the bars.
- Surprisingly Simple: This is a classic “dump and mix” cake. No creaming butter and sugar, no fussy steps. It comes together in one bowl with minimal cleanup.
- Crowd-Pleasing Guarantee: Its classic, beloved flavor appeals to both kids and adults. It’s the perfect dessert for any gathering, from a casual family dinner to a festive birthday party.
- Perfect for Beginners: The method is forgiving and the visual cues are clear. If you’re new to layer cakes, this is a fantastic recipe to build your confidence.
- Customizable Foundation: While perfect as-is, this cake is a wonderful canvas for your creativity. I’ll share my favorite professional variations later.
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Ingredients You’ll Need
- Let’s gather our ingredients—this is where simple pantry staples transform into pure magic. Using quality ingredients here makes a noticeable difference, especially with the cocoa.
For the cake, you’ll need the usual suspects: granulated sugar for sweetness and tenderness, all-purpose flour (spooned and leveled, please, for accuracy!), and leaveners (baking powder and baking soda) to give our cake its beautiful rise. The star is Hershey’s Cocoa. I specify this brand not for sponsorship, but because its consistent flavor profile is what gives this cake its iconic taste.
Eggs, milk, vegetable oil, and vanilla provide structure, moisture, and flavor.
Now, for the game-changer: boiling water. Trust me, don’t skip it. It’s the key to that fudgy, moist texture.
Finally, for the signature twist, you’ll need Hershey’s Milk Chocolate Bars to chop and fold into the filling.
For the frosting, we’re making a simple yet luxurious chocolate buttercream with softened unsalted butter, more Hershey’s Cocoa, powdered sugar, milk, and vanilla. It whips up into a silky, spreadable dream.
Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.
Kitchen Equipment Needed
You don’t need any specialty tools for this recipe. A stand mixer or a sturdy hand mixer will make the batter and frosting a breeze. Two 9-inch round cake pans are essential.
I highly recommend lining the bottoms with parchment paper after greasing and flouring—it guarantees a clean release every time. You’ll also need a large mixing bowl, a wire cooling rack (crucial for letting the cakes cool properly), and an offset spatula for frosting the cake neatly. A simple serrated knife is perfect for leveling the cake tops if they dome slightly.
How to Make Hershey Bar Cake Recipe
Step 1: Combine the Dry Ingredients
Preheat your oven to 350°F (175°C) and prepare your pans. In the bowl of your stand mixer, add the sugar, flour, cocoa, baking powder, baking soda, and salt. Mix these on low speed for about 30 seconds.
This isn’t just mixing; it’s aerating and ensuring the leaveners are evenly distributed throughout the flour. Believe me, this simple step prevents those dreaded bitter pockets of baking soda in your finished cake.
Step 2: Create the Base Batter
Add the room-temperature eggs, milk, vegetable oil, and vanilla extract to the dry ingredients. Now, mix on medium speed for a full 2 minutes, stopping once to scrape down the sides and bottom of the bowl. This extended mixing time develops the structure of the batter and ensures everything is perfectly emulsified.
The batter will be quite thick and shiny at this stage.
Step 3: The Secret to Moisture
Reduce the mixer speed to low. This is important. Carefully and slowly pour the cup of boiling water into the batter.
The batter will become very thin and almost soupy—this is exactly what you want! Tip from me: Don’t panic. The hot water “blooms” the cocoa powder, intensifying its flavor, and the steam created during baking is what gives this cake its legendary moist, tender texture.
Step 4: Bake to Perfection
Divide the thin batter evenly between your two prepared pans. Give each pan a gentle tap on the counter to settle the batter and pop any large air bubbles. Slide them into the preheated oven and bake for 30 to 35 minutes.
You’ll know they’re done when the tops spring back lightly when touched and a toothpick inserted into the center comes out clean or with a few moist crumbs attached.
Step 5: Cool and Frost
Let the cakes cool in their pans on a wire rack for exactly 10 minutes. This allows them to set slightly so they don’t fall apart. Then, run a knife around the edges, invert them onto the rack, and peel off the parchment paper.
Let them cool completely. This is non-negotiable—frosting a warm cake is a recipe for a melted, sliding mess. While they cool, whip up the frosting by beating the butter, cocoa, powdered sugar, milk, and vanilla until light and fluffy.
Step 6: Assemble and Serve
Now for the fun part! Place one cake layer on your serving plate. Spread a thick layer of frosting on top and sprinkle generously with half of your chopped Hershey’s bars.
Place the second layer on top. Use the remaining frosting to cover the top and sides of the cake. Finally, press the rest of the chopped chocolate bars onto the sides and top.
Step back and admire your masterpiece before slicing.
A few insights from my years in the kitchen will ensure your cake is bakery-perfect:
- Room Temperature is Key: Using room-temperature eggs and milk helps them incorporate smoothly into the batter, preventing overmixing which can lead to a tough cake.
- Don’t Skip the Sifting: If your cocoa powder is at all lumpy, sift it with the other dry ingredients. This guarantees a perfectly smooth batter without any gritty bits.
- The Toothpick Test: When checking for doneness, look for a few moist crumbs on the toothpick, not necessarily completely clean. A completely clean pick can sometimes mean the cake is overbaked and will be dry.
- Leveling for Looks: If your cakes have a slight dome, use a serrated knife to carefully slice off the rounded top to create a flat surface before stacking. This makes for a more stable and professional-looking cake.
- Frosting Consistency: Your frosting should be thick but spreadable. If it’s too stiff, add milk a teaspoon at a time. If it’s too runny, add more powdered sugar a quarter cup at a time.
Recipe Variations
- This classic recipe is wonderfully adaptable. Here are some of my tested and loved variations:
- Dark Chocolate Decadence: Substitute the milk chocolate bars for Hershey’s Special Dark chocolate bars and use dark cocoa powder in the frosting for an intensely rich, grown-up version.
- Mint Chocolate Chip: Add 1 teaspoon of peppermint extract to the frosting and fold in 1/2 cup of mini chocolate chips instead of the chopped bars for a refreshing twist.
- Chocolate Caramel Delight: Before adding the second cake layer, drizzle the frosted bottom layer with 1/4 cup of thick caramel sauce, then sprinkle with sea salt flakes along with the chopped chocolate.
- Mocha Infusion: Replace 1/4 cup of the boiling water in the cake batter with 1/4 cup of strong brewed coffee or espresso to enhance the chocolate flavor without a strong coffee taste.
- Gluten-Free Adaptation: Use a 1:1 gluten-free all-purpose flour blend (like Bob’s Red Mill) in place of the regular flour. The structure holds up beautifully.
- Cupcake Version: This batter makes about 24 cupcakes. Fill liners 2/3 full and bake for 18-22 minutes. Frost and top with a mini Hershey’s bar.
What to Serve With This Recipe
This cake is a star on its own, but it can anchor a fantastic dessert spread. For a classic pairing, serve it with a scoop of vanilla bean ice cream—the cold creaminess is the perfect contrast to the rich, room-temperature cake. A dollop of freshly whipped cream and some raspberries or strawberries add a lovely, slightly tart element that cuts through the sweetness.
Beverage-wise, a glass of cold milk is the nostalgic choice, while a cup of black coffee or a dark roast decaf complements the deep chocolate notes perfectly. It’s ideal for birthdays, holiday dinners, or as the grand finale to a summer barbecue.
Storage & Make-Ahead Instructions
- This cake stores beautifully. Once frosted, store it covered at room temperature for up to 2 days (if your kitchen is cool). For longer storage, refrigerate it in an airtight container for up to 5 days. The cold will firm up the frosting, so let slices sit at room temperature for 30 minutes before serving for the best texture and flavor.
- Freezing: You can freeze the unfrosted cake layers very successfully. Wrap each cooled layer tightly in plastic wrap, then in foil. Freeze for up to 3 months. Thaw overnight in the refrigerator before frosting.
- Make-Ahead Strategy: Bake and cool the cake layers up to 2 days ahead. Wrap them tightly in plastic wrap and store at room temperature. Make the frosting 1 day ahead, store it covered in the fridge, and let it come to room temperature, then re-whip before using.
- Avoid: Do not store the cake in the refrigerator uncovered, as it will dry out and absorb odors.
Frequently Asked Questions
Q: Can I use a different type of cocoa powder?
A: For the authentic “Hershey Bar” flavor, I strongly recommend Hershey’s natural unsweetened cocoa. Using Dutch-processed cocoa will change the chemical reaction with the baking soda and may affect the cake’s rise and color.
Q: My batter was very watery. Did I do something wrong?
A: No, you did it right! The batter is supposed to be very thin after adding the boiling water. This is what creates the exceptionally moist texture.
Just be careful when pouring it into the pans.
Q: Can I make this in a 9×13 inch pan instead?
A: Absolutely. Pour all the batter into a greased and floured 9×13 pan. The baking time will be slightly longer, around 35-40 minutes.
Test with a toothpick for doneness.
Q: Why do my cakes have a dome in the middle?
A: This is normal! It’s caused by the edges setting faster than the center. For flatter layers, you can use cake strips (wet fabric strips wrapped around the pan) to insulate the edges, or simply level the domes with a knife after cooling.
Q: The frosting is too sweet for me. Can I adjust it?
A: Yes. You can reduce the powdered sugar by 1/2 cup and add a pinch of salt to balance the sweetness. Using a darker cocoa powder will also provide a more bittersweet flavor profile.
Q: Can I use a different chocolate bar for the filling?
A: Of course! Hershey’s Cookies ‘n’ Creme, Mr. Goodbar, or even a mix of milk and dark chocolate bars work wonderfully and add fun texture and flavor surprises.
Q: How do I get clean slices when cutting the cake?
A: For picture-perfect slices, dip a sharp knife in hot water, wipe it dry, and then cut. Repeat this between each slice. The heat helps the knife glide through the frosting and cake cleanly.
Final Thoughts
This Hershey Bar Cake is more than just a recipe; it’s a reliable, joyful baking project that delivers spectacular results every single time. It embodies what I love most about baking: taking simple, accessible ingredients and creating something that brings genuine delight to the table. The combination of that impossibly moist crumb, the rich cocoa flavor, and the sweet bursts of real chocolate bar makes it a timeless classic.
I encourage you to give it a try, whether it’s for a special occasion or just a regular Tuesday that needs a little upgrade. Don’t forget to let the cakes cool completely—your patience will be rewarded with the easiest frosting job ever. Once you take that first bite, I think you’ll understand why this cake has been a favorite for generations.
If you make it, I’d love to hear how it turned out! Share your creation online and tag me. And if you’re looking for your next baking adventure, check out my recipe for a classic sour cream coffee cake or a batch of chewy chocolate chip cookies.
Happy baking
Hershey Bar Cake
- Author: Harper
- Prep Time: 20 minutes
- Cook Time: 35 minutes
- Total Time: 55 minutes
- Yield: 12 servings
- Category: Dessert
- Cuisine: American
Description
This incredibly moist and rich chocolate cake is made with Hershey's cocoa and chopped chocolate bars, then topped with a silky chocolate frosting. It's a classic, crowd-pleasing dessert that's surprisingly simple to make.
Ingredients
Instructions
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Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans, or line them with parchment paper. In the bowl of a stand mixer fitted with the paddle attachment, combine the sugar, flour, cocoa, baking powder, baking soda, and salt. Mix on low speed for 30 seconds to combine and aerate the dry ingredients.
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Add the eggs, milk, oil, and vanilla to the dry ingredients. Mix on medium speed for 2 minutes, scraping down the sides of the bowl once. The batter will be thick. Trust me, this is normal. With the mixer on low, carefully and slowly pour in the boiling water. The batter will become very thin and liquid—this is what creates that famously moist texture.
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Divide the batter evenly between the prepared pans. Tap the pans gently on the counter to release any large air bubbles. Bake for 30 to 35 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs. The tops should spring back when lightly touched.
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Let the cakes cool in their pans on a wire rack for 10 minutes. Then, carefully run a knife around the edges and invert them onto the rack to cool completely. Tip from me: Cooling completely is non-negotiable for easy frosting. If the cakes are even slightly warm, the frosting will melt and slide right off.
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While the cakes cool, make the frosting. In a large bowl, beat the softened butter until creamy. Add the cocoa and beat until combined. Gradually add the powdered sugar alternately with the milk, beating on medium speed. Add the vanilla and beat until light and fluffy, about 3-4 minutes. If the frosting is too thick, add a teaspoon more milk. If too thin, add a bit more powdered sugar.
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Place one cake layer on your serving plate. Spread a generous amount of frosting over the top. Sprinkle half of the chopped Hershey's bars over the frosting. Place the second layer on top. Frost the top and sides of the cake with the remaining frosting. Press the remaining chopped chocolate bars onto the sides and top of the cake for decoration. Slice, serve, and enjoy the chocolate bliss!
Notes
- Chef's Tips:
- For a flatter cake top (easier to stack), use Bake Even Strips around the pans.
- A common mistake is under-mixing the batter after adding the wet ingredients. The full 2 minutes is key for structure.
- Serve at room temperature for the softest texture and fullest chocolate flavor.
- Food Safety:
- Cake with dairy-based frosting should not be left at room temperature for more than 2 hours
- Store leftovers in an airtight container
