01 -
In a medium bowl, stir together salt, baking powder, and flour.
02 -
Cream sugar and butter until they look fluffy. Toss in vanilla and the egg, then mix again.
03 -
Slowly add the dry mix in two parts, blending just until it all comes together.
04 -
Split the dough into three parts. Add red to one, green to another, and leave the last plain.
05 -
Shape each dough into a 10-inch square. Stack them: red first, plain next, then green on top.
06 -
Roll up the dough into a log from one edge. Place in the fridge for about an hour to chill.
07 -
Cut slices about a quarter-inch thick, then bake at 350°F for 12-15 minutes.