Preheat oven to 350 degrees F. Mix and bake the cupcakes according to the package directions. Allow to cool completely.
Frost the cupcakes with the vanilla frosting, using a piping bag, food storage bag, or an off set spatula or knife.
Paint Baymax's eyes using the black gel icing, onto one side of each jumbo marshmallow. Allow to dry and set for a few minutes. Top each cupcake with the marshmallow and you're done! Enjoy!