Preheat the oven to 350°F and line a muffin tin with four cupcake liners.
In a medium bowl, whisk together the flour, cocoa powder, sugar, and baking powder.
Add the cooled coffee, milk, egg, and oil to the dry ingredients and stir until the batter is smooth.
Divide the batter evenly among the four liners and bake for 18 minutes, or until a toothpick comes out clean. Let the cupcakes cool completely.
Melt the chocolate wafers in the microwave in 30-second bursts, stirring until smooth. Dip the open end of each sugar cone into the melted chocolate and set aside on parchment paper to harden.
In a separate bowl, beat the softened butter with the powdered sugar, cocoa powder, and remaining tablespoon of coffee until the frosting is light and spreadable.
Spread or pipe the mocha frosting onto each cooled cupcake. Place one chocolate-dipped cone on top of each cupcake to form the witch hat and add a few orange sprinkles around the base.