Whisk together the flour, baking powder, and salt; set aside.

Beat the butter and sugar together until light and fluffy.

Beat in the egg, then mix in the vanilla.

Gradually mix in the dry ingredients until a soft dough forms.

Divide the dough in half and knead red food coloring into one half.

Roll each half into a matching rectangle and stack them.

Roll tightly into a log, wrap, and refrigerate for at least 2 hours.

Slice into rounds and bake at 350°F for 10 to 12 minutes.