Preparation Steps

• In a medium bowl, whisk together the flour, baking powder, and salt.
• In a large bowl, beat the butter and sugar until light and fluffy. Add the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.
• Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
• Divide the dough into two equal parts. Tint one part with red food coloring and the other part with green food coloring, kneading until the color is evenly distributed.
• Roll each colored dough into an 8x8 inch square. Place the green dough on top of the red dough and roll up tightly to form a log. Wrap the log in plastic wrap and refrigerate for at least 1 hour.
• Preheat the oven to 350°F (175°C). Slice the chilled dough log into 1/4 inch slices and place on a baking sheet lined with parchment paper.
• Bake in the preheated oven for 10-12 minutes, or until the edges are just starting to brown. Cool on a wire rack.