Red, white & blue tie dye cookies recipe

Ingredients

• 10 tablespoons (1 1/4 sticks) unsalted butter, room temperature
• 1/2 cup sugar
• 1/4 teaspoon salt
• 1 large egg
• 1 1/4 teaspoons vanilla extract
• 2 cups all purpose flour
• 3 1/4 cups (or more) powdered sugar, sifted
• 4 teaspoons meringue powder + 4 Tablespoons water = 2 egg whites
• 1 teaspoon pure vanilla extract