Gather the ingredients.

Sift the flour, baking powder, baking soda, and salt together into a bowl. Resift again into another bowl.

Beat the butter with the brown and white sugars in a mixing bowl until light and fluffy. Beat in the eggs and vanilla until smooth.

Gradually stir in the flour mixture until evenly blended.

Divide the dough into two equal parts. Add red food coloring to one part and green food coloring to the other, blending until evenly mixed.

Roll out the red dough and green dough to 1/4 inch thickness. Place the green dough on top of the red dough and roll into a log.

Wrap the log in waxed paper and a cotton towel. Refrigerate at least 8 hours.

Preheat oven to 400°F (200°C). Lightly grease 2 baking sheets.

Unwrap the dough log, slice into rounds, and place on prepared baking sheets.