I think my dad likes my mom to make her Chocolate Mayonnaise Cupcakes just so he can get the graham cracker goodies.
2 1/2 Cups Powdered Sugar
2 Tablespoons Unsweetened Cocoa Powder
2 Tablespoons Butter - Softened to room temperature
1 Teaspoon Pure Vanilla
2-4 Tablespoons Milk
Mix powdered sugar and cocoa powder together. Add remaining ingredients and stir until smooth. I usually do this by hand, but you could use a mixer.