Cream the butter with the sugar in a stand mixer on medium speed until light and fluffy, about 3 minutes.
When ready to bake, preheat the oven to 350 degrees F. Place rolled-and-cut cookie shapes on an ungreased baking sheet. Brush them with the reserved egg whites and sprinkle on colored candies.
Bake cookies for 10-12 minutes until lightly golden and transfer to a cooling rack.
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