Marbled Dark Chocolate Peppermint Spritz Cookies

Bahan-bahan (50 porsi)

• 1 cup butter (2 sticks) softened to room temperature
• 3/4 cup sugar
• 1 large egg
• 1 1/2 teaspoons peppermint extract
• 1 teaspoon vanilla extract
• 2 1/4 cups all purpose flour
• 1/3 cup unsweetened dark chocolate cocoa powder
• 1/2 teaspoon salt
• White chocolate baking melts
• Red gel food coloring