01 -
Set oven to 200°F. Line a baking sheet with parchment paper.
02 -
In a clean large bowl, beat egg whites on low speed. Add cream of tartar, gradually adding sugar while increasing speed to high until stiff peaks form.
03 -
Pipe meringue onto the prepared baking sheet, forming ghost-shaped mounds.
04 -
Bake for 2 hours, then turn off the oven and leave meringues inside for 30 more minutes to dry.
05 -
Combine softened butter, confectioners' sugar, milk, and purple gel coloring. Mix until smooth and creamy.
06 -
Spread the purple buttercream evenly over cooled cupcakes.
07 -
Top each cupcake with a meringue ghost. Add eyes and mouth details using black decorating frosting.