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Mini Chocolate Layer Cake with Peanut Butter and Salted Caramel

by roselevit

I’ve been super into cake decorating videos for the past, I don’t know, fifteen years? It sucks, though, because almost everything I want to make requires specialized equipment. Yeah, I could buy a specialized stamp that makes fondant look like lace, but how often would I actually use it?

I’m easing slowly into real-life cake decorating and trying not to buy more equipment than I need. Today, I decorated this cake using only some Ziploc bags, a set of piping tips, and a butter knife. Granted, it’s not a very complicated design, but I think it looks pretty effective. Minimalist works as an aesthetic! Plus, it tastes so good that no matter how pretty it looks, you’ll forget about the appearance as soon as you take a bite.

I adapted this recipe from a chocolate cupcake recipe on Sally’s Baking Addiction. Since my post is more of a “how to construct a tiny layer cake” and less of a “make this recipe that I invented,” I don’t feel bad about using her ideas. The cake is super moist, chocolatey, and fudgy. I filled the layers with a peanut butter and salted caramel buttercream, then covered the cake with a plain chocolate buttercream. If you have whole peanuts, chocolate chips, fresh fruit, or anything else you think would be good on top, go ahead and decorate it further. I didn’t have any of that, so I kept it simple.

This layer cake is tiny because I don’t want the responsibility of finishing a whole 8″ or 9″ layer cake. There’s also the simple issue of fridge space. If you love cake but don’t want the commitment of a celebration-sized one, this size is perfect.

If you have experience decorating cakes, you’ll notice a few things about my process. First, I didn’t add simple syrup to the cakes because the decoration wasn’t very time-consuming, so the cakes didn’t have much time to dry out. They were still moist and delicious after two days in the fridge. I also didn’t level the cakes because the layers are already very thin and they didn’t dome very much in the oven.

For this cake, you’ll need the following equipment:

  • At least one, but up to three 6″ round cake pans (if less than three, simply bake the cake in batches)
  • Parchment paper
  • A pencil and scissors
  • Digital kitchen scale
  • Piping or Ziploc bags
  • 2 piping tips: round and star-shaped
  • Whisk or electric hand mixer
  • Several mixing bowls
  • An offset spatula or butter knife

Mini Chocolate Layer Cake with Peanut Butter and Salted Caramel

This tiny layer cake has three layers of moist, fudgy chocolate cake, sandwiched with a salted caramel and peanut butter buttercream and topped with a chocolate buttercream. It's beautiful to look at and incredibly delicious.
Prep Time 2 hrs 30 mins
Cook Time 20 mins
Total Time 2 hrs 50 mins
Servings 8 slices



  • ¾ cup (95 g) all-purpose flour spoon and leveled
  • ½ cup unsweetened cocoa powder
  • ¾ tsp baking powder
  • ½ tsp baking soda
  • ¼ tsp salt
  • 2 eggs at room temperature
  • ½ cup granulated sugar
  • ½ cup packed light brown sugar
  • cup avocado oil or other neutral high-heat oil
  • 2 tsp vanilla extract
  • ½ cup buttermilk at room temperature

Salted Caramel and Peanut Butter Buttercream

  • ¼ cup smooth peanut butter I used Skippy
  • ¼ cup salted caramel sauce homemade or store-bought
  • 1 stick unsalted butter softened
  • 1-2 cups powdered sugar

Chocolate Buttercream

  • 1 stick unsalted butter softened
  • 1 ¾ cups powdered sugar
  • ¼ cup unsweetened cocoa powder
  • A pinch of salt
  • 1 tsp vanilla extract
  • 2 tbsp milk


  • PREPARE THE EQUIPMENT: Preheat the oven to 350º F. Lay your 6" cake pan(s) on parchment paper, trace around them with a pencil until you have 3 circles, and cut them out with kitchen scissors. Grease the bottom and sides of each pan, lay the parchment circles inside, and grease the top of the parchment. Set the pans aside. Use a kitchen scale to take the tare weight of the bowl in which you'll make your cake batter.
  • MAKE THE CAKES: Whisk together the flour, cocoa powder, baking powder, baking soda, and salt in the bowl you just weighed. In a separate bowl, combine the eggs, both kinds of sugar, oil, and vanilla. Pour half of the wet ingredients into the dry, add half the buttermilk, and stir to combine. Add the rest of the wet ingredients and buttermilk and stir until just incorporated. Don't overmix.
  • BAKE: Weigh the bowl of cake batter and subtract the weight of the bowl. Divide the remainder by 3; this is the amount of batter you'll put in each pan. Divide the batter evenly between the pans and bake for 19-21 minutes, or until a toothpick inserted in the center comes out clean.
  • COOL THE CAKES: As soon as the cakes come out of the oven, turn them out onto a cooling rack. Don't peel off the parchment until the cakes have cooled to room temperature. At this point, transfer the cakes to the fridge to cool completely, about 1-2 hours. Meanwhile, make the frosting.
  • BUTTERCREAM FROSTING: In two separate bowls, combine the ingredients for each buttercream using a whisk or electric hand mixer. Beat until no lumps remain. For the salted caramel peanut butter buttercream, the amount of sugar added will depend on the peanut butter and caramel sauce you use. Start with one cup and continue to add by the spoonful until you have the consistency you want. Prepare two piping bags or cut a very small tip off one corner of two Ziploc bags. Fit a medium-sized round tip on one bag and add the chocolate buttercream. Fit a star tip on the other bag and add the peanut butter and salted caramel buttercream. Keep the frosting at room temperature until ready to use.
  • ASSEMBLE THE CAKE: Add one layer of cake to the surface on which you'll construct your cake (a plate, cake stand, or cutting board would work). Pipe a tight spiral of peanut butter frosting on top. Add the second cake layer and repeat with more frosting. Add the final layer and make sure the layers are lined up as evenly as possible. Don't frost the top of the cake yet. Pipe extra frosting to fill in any gaps in the layers – you want the cake to be as cylindrical as possible. Chill the cake again for about 20 minutes.
  • FROST THE CAKE: Use an offset spatula or butter knife to spread a generous layer of chocolate buttercream over the top and sides of the cake. Prepare a cup of very hot water and rinse off the knife after each stroke; this helps get the frosting completely smooth. Work quickly so the hot water doesn't melt the buttercream. Chill for another 10-20 minutes, or until set.
  • FINISHING TOUCHES: Wipe down the surface around the cake. Pipe rings of stars around the bottom and top edges of the cake with the peanut butter frosting. Decorate with additional piping, fruit, nuts, or anything else you wish. Chill completely and serve cold.
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