✓ Preheat the oven to 350°F

✓ Prepare the mini cake pans

✓ Whisk together flour, cocoa powder, baking powder, baking soda, and salt

✓ Beat the butter and sugar until light and fluffy

✓ Beat in eggs one at a time

✓ Beat in vanilla extract

✓ Add the flour mixture to the wet ingredients in three parts, alternating with the buttermilk

✓ Divide the batter evenly among the prepared pans

✓ Bake for 15-20 minutes

✓ Let cool in pans for 5 minutes before transferring to a wire rack

✓ Prepare the ganache by heating the heavy cream

✓ Pour the cream over the chopped semi-sweet chocolate

✓ Stir the chocolate mixture gently until smooth

✓ Assemble by placing a cooled cake on a serving plate and spooning the warm ganache over the top