perfect blend of rich chocolate and aromatic coffee

1. Prepare the cake:
   • Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
   • In a large bowl, whisk together flour, cocoa powder, baking powder, baking soda, and salt.
   • In a separate bowl, whisk together the granulated sugar, brown sugar, eggs, coffee, buttermilk, vegetable oil, vanilla extract, and instant espresso powder until smooth.
   • Gradually add the dry ingredients to the wet mixture, stirring until fully combined. The batter will be slightly thin, which is perfect for a moist cake.
   • Pour the batter evenly into the prepared cake pans and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
   • Allow the cakes to cool in the pans for about 10 minutes, then transfer to wire racks to cool completely.
2. Make the coffee buttercream frosting:
   • In a large mixing bowl, beat the softened butter until creamy and smooth.
   • Gradually add powdered sugar, cocoa powder, brewed coffee, and vanilla extract. Continue beating until smooth and fluffy.
   • Add a pinch of salt to balance the sweetness. If the frosting is too thick, add a little more coffee to reach your desired consistency.
3. Assemble the cake:
   • Once the cakes are completely cool, slice them in half horizontally to create four layers (optional for a taller cake).
   • Place the first cake layer on your cake stand or plate. Spread a generous amount of coffee buttercream frosting over the top.
   • Repeat for each layer, finishing with a layer of frosting on top.
   • Optionally, decorate the top with chocolate shavings, whole coffee beans, or a dusting of cocoa powder.
4. Serve & Enjoy:
   • Let the cake set for a bit in the fridge to firm up the frosting, if needed, and then slice and serve.
   • The coffee and chocolate combo makes this cake perfect for pairing with a hot cup of coffee or tea!

This cake is an ideal balance of deep chocolate flavor with a subtle coffee kick, making it a perfect treat for any occasion. Would you like to add any additional flavors or fillings, like a layer of chocolate ganache or a hint of cinnamon in the frosting?