I had an adoptive grandmother (my uncle’s wife’s mother) that used to make an AMAZING pinwheel cookie. Unfortunately, she has passed on, and this is not her recipe. I’m afraid I don’t have access to that bit of family lore. This recipe is close though! What she did differently, that I suggest is before layering the two doughs together, she lightly dusted the bottom layer of dough with a little cocoa powder and sugar. This adds a little hit of chocolate and sweetness to each bite. I also suggest slightly dampening the bottom of the top layer of dough before placing it on top of the bottom layer. This will help the two stick together better. This recipe will make about 4 dozen cookies.
2 ⅔ cups all-purpose flour
¾ teaspoon baking powder
⅛ teaspoon baking soda
¾ teaspoon salt
¾ cup and 2 tablespoons and 1 teaspoon butter or margarine
⅔ cup packed brown sugar
¼ cup and 3 tablespoons white sugar
1 egg, beaten
1 teaspoon vanilla extract
1 ounce unsweetened baking chocolate
Sift the flour, baking powder, baking soda, and salt together into a bowl. Re-sift again into another bowl.
Beat the butter with the brown and white sugars in a mixing bowl until light and fluffy. Beat in the egg and vanilla until smooth. Gradually stir in the flour mixture until evenly blended. Gather the dough into a ball, and divide into two equal parts.
Melt the unsweetened baking chocolate in a pan over low heat or in the microwave. Cool slightly, and mix the chocolate into one half of the dough until well blended.
Roll out the brown dough to ¼ inch thickness. Roll out the white dough to ¼ inch thickness, and place on top of the brown dough. Beginning on one edge, roll the doughs to make a log so the two colours spiral inside each other. Wrap the log in waxed paper, then in a cotton towel, and refrigerate at least 2 hours, but overnight is best.
Preheat the oven to 400 degrees. Lightly grease 2 baking sheets. Unwrap the dough log, and place on a clean, lightly floured surface. Slice the log into rounds ⅛ inch thick, and place on prepared baking sheets.
Bake in preheated oven until set, 5 to 6 minutes. Watch carefully to prevent edges from browning. Remove from oven, and cool on racks.