Prepare cupcake batter according to the instructions on the boxed mix. Line a muffin tin with cupcake liners.
Shape the bunny heads by rolling three small balls of aluminum foil and placing them between the cupcake liner and the muffin tin to form a rounded triangle shape.
Fill each liner about 2/3 full with the prepared batter.
Bake according to the package directions. Once done, remove from oven and let the cupcakes cool completely.
Frost each cupcake with storebought vanilla frosting using a butter knife or spatula.
Cut large marshmallows in half diagonally.
Dip the cut side of each marshmallow into pink sanding sugar to create the bunny ears.
Press two marshmallow ears into the top of each frosted cupcake.
Serve and enjoy! Store in an airtight container until ready to serve.