01 -
Preheat oven to 200°F. Line a baking sheet with parchment paper.
02 -
In a large bowl, beat egg whites on low speed. Add cream of tartar, then gradually add sugar while increasing speed to high until stiff peaks form.
03 -
Pipe meringue onto prepared baking sheet in ghostly shapes. Bake for 2 hours, then turn off oven and leave meringues inside for 30 more minutes to dry.
04 -
Combine softened butter, confectioners' sugar, milk, and purple gel coloring; mix until smooth and creamy.
05 -
Frost cooled cupcakes with purple buttercream. Top each cupcake with a meringue ghost.
06 -
Use black decorating frosting to create eyes and mouth on each meringue ghost.