For the cupcakes:
1½ cups hot brewed coffee
¾ cup unsweetened cocoa powder
2¼ cups all-purpose flour
1½ tsp. baking soda
¾ tsp. baking powder
½ tsp. salt
12 tbsp. (1½ sticks) unsalted butter, at room temperature
1½ cup packed brown sugar
¾ cup granulated sugar
3 large eggs
1 tbsp. vanilla extract

For the ganache:
6 oz. bittersweet chocolate, finely chopped
½ cup heavy cream

For the peanut butter cookie frosting:
9 tbsp. unsalted butter, at room temperature
1½ cups creamy peanut butter
3 cups confectioners’ sugar