1. Prepare the pans

Preheat the oven to 350°F (175°C).

Grease three 8-inch round cake pans. Line the bottoms with parchment paper and lightly grease the parchment.

2. Mix the dry ingredients

In a large bowl, whisk together flour, cocoa powder, sugar, baking powder, baking soda, and salt.

Break apart any visible cocoa lumps.

3. Add the wet ingredients

Add eggs, milk, vegetable oil, and vanilla.

Mix on low speed until combined. Scrape the bottom and sides of the bowl.

4. Add the hot coffee

With the mixer running on low, slowly pour in the hot coffee.

Mix only until the batter is smooth.

The batter will be relatively thin. This is normal. Do not add extra flour.

5. Divide and bake

Divide the batter evenly between the three prepared pans.

For the most uniform layers, weigh the filled pans or divide the batter by weight.

Bake for 24–30 minutes.

Begin checking at 24 minutes. The cakes are ready when the centers spring back gently and a toothpick inserted near the center comes out clean or with a few moist crumbs.

6. Cool completely

Let the layers cool in their pans for about 10 minutes.

Turn them onto wire racks, remove the parchment, and leave them until completely cool.

Do not frost warm cake.

7. Make the peanut butter buttercream

Beat the softened butter for 2–3 minutes until creamy.

Add the peanut butter and beat until smooth.

Add the powdered sugar gradually on low speed.

Add the heavy cream, vanilla, and salt.

Beat for another 2–3 minutes until light and fluffy.

If necessary, add additional cream 1 tablespoon at a time.

The finished buttercream should spread easily while remaining firm enough to hold a piped swirl.

8. Level and fill

If necessary, level completely cooled cake layers with a serrated knife.

Place the first layer on a cake board or serving plate.

Spread approximately 3/4 cup buttercream over it.

Add the second layer and repeat.

Place the third layer on top.

9. Apply the crumb coat

Spread a very thin layer of buttercream over the top and sides.

Refrigerate for 20–30 minutes.

This traps loose chocolate crumbs and gives the final frosting a cleaner finish.

10. Apply the final buttercream

Cover the chilled cake with the remaining peanut butter buttercream, reserving approximately 1 1/2 to 2 cups for the large decorative swirls.

Smooth the top and sides.

Refrigerate the frosted cake for another 20 minutes before adding ganache.

11. Make the ganache

Place the finely chopped chocolate in a heatproof bowl.

Heat the cream until steaming and just beginning to simmer around the edges.

Pour it over the chocolate.

Wait 2 minutes without stirring.

Stir slowly until completely smooth and glossy.

12. Cool the ganache

This step is critical.

Allow the ganache to cool until it remains pourable but is no longer hot.

Test one drip on the back of the chilled cake.

If it immediately runs to the bottom, stop. The ganache is still too warm or thin.

If it barely moves, gently warm the ganache for a few seconds.

13. Create the chocolate drip

Once the consistency is correct, add individual ganache drips around the edge.

Spread the remaining ganache over the top.

Keep the drips irregular in length to reproduce the reference appearance.

14. Pipe the peanut butter swirls

Fit a piping bag with a large open-star tip.

Fill it with the reserved peanut butter buttercream.

Pipe 8–10 tall swirls around the outer edge of the cake.

15. Add the peanut butter cups

Cut several peanut butter cups in half.

Position them between the buttercream swirls, with their ridged chocolate edges visible.

16. Make the truffle crunch center

Roughly chop the remaining peanut butter cups.

Combine them visually with the chopped chocolate-peanut butter candies and chocolate chunks.

Pile them generously into the center.

Do not crush everything into crumbs. Keeping pieces of different sizes gives the cake its characteristic truffle crunch appearance.

Scatter a small amount around the bottom edge of the cake to match the reference presentation.

 

Add these crunchy pieces as close to serving as practical for the best texture.