Cream the butter and sugar in a large bowl for 3 minutes until fluffy.

Add the egg and vanilla extract. Mix until well combined.

Whisk the flour, baking powder, and salt in a separate bowl.

Add the dry ingredients to the wet ingredients. Mix until a dough forms.

Divide the dough into two equal halves.

Add red gel food coloring to one half and mix until the color is solid. Leave the other half white.

Wrap both dough balls in plastic and chill for 30 minutes.

Roll out the white dough into a rectangle between parchment paper. Do the same for the red dough.

Remove the paper and stack the red dough on top of the white dough.

Roll the stacked dough tightly into a log, starting from the long edge.

Wrap the log in plastic wrap and chill for at least 2 hours.

Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.

Slice the log into 1/4-inch thick rounds.

Bake for 10-12 minutes until set. Cool on a wire rack.