Prepare cupcake batter according to the instructions on the box.
Line a cupcake/muffin pan with paper baking cups.
Roll aluminum foil into small balls.
Add 2 Tbsp. (medium cookie scoop) of cupcake batter to each baking cup.IMPORTANT: DO NOT OVERFILL THE BAKING CUPS! Normally you'd need to fill the baking cup 2/3 with batter. Not for these. Use half the batter that you'd normally use, which is about 2 Tbsp or a medium-sized cookie scoop.
Position the foil balls around between the metal from the pan and the cupcake liner. Two at the top, and two near the center to create a head and arms.
Bake cupcakes for 16-18 minutes. Let cupcakes cool in the pan for 10-15 minutes before transferring to a wire cooling rack. This will help them keep their shape while they cool.
Cool completely.
Frosting
Beat butter with an electric mixer until smooth.Add half of the powdered sugar and mix until smooth. Add remaining powdered sugar and beat.
Beat in vanilla. Add milk, 1 tablespoon at a time until the desired consistency is reached.
Add a frosting tip to a frosting bag and fill it with buttercream.
Frost cupcakes then smooth with a butter knife or cake spatula (watch my video to see how I do this).
Add candy eyes and mouth.
Video
Notes
Cupcake pan notes: I have a giant pan that bakes 24 cupcakes at a time. It works great for this recipe since it makes 36 cupcakes. I use the large pan and a regular muffin pan to bake them at the same time.Store cupcakes in an airtight container at room temperature for up to 3 days.