2 cups all-purpose flour, plus more for dusting
1/2 teaspoon baking powder
1/4 teaspoon salt
1 1/2 sticks (12 tablespoons) unsalted butter, at room temperature
2/3 cup granulated sugar
1 large egg
1/2 teaspoon vanilla extract
1/4 teaspoon cinnamon extract (optional)*
1 teaspoon unsweetened coca powder
3/4 teaspoon red food coloring
1 teaspoon ground cinnamon
1 tablespoon sanding sugar (clear or red), plus more for coating
Whisk the flour, baking powder and salt in a medium bow. Beat the butter and granulated sugar in a large bowl with a mixer on medium-high speed until light and fluffy, 3 to 5 minutes. Beat in the egg and vanilla until incorporated. Reduce the mixer speed to low; add the flour mixture and beat until just com ined. Remove half of the dough and wrap i plastic wrap. dd the cinnamon extract, cocoa powder and food coloring to the remaining dough bea until incorporated; wrap in plastic wrap. Refrigerate both pieces of dough until firm, about 1 hour.
Dust the dough with flour and roll out each piece on parchment paper into a 10-by-11-inch rectangle. Flip the red dough on top of the plain dough; remove the top piece of parchment and trim the edges. Sprinkle the ground cinnamon and sanding sugar on top Starting from a shorer end, tightly roll up the dough, using the parchment to help; roll the log in sanding sugar. Wrap in plastic wrap and refrigerate until firm, at least 3 hours or overnight.
Position rack in the upper and lower thirds of the oven and preheat to 350 degrees F. Line 2 baking sheets with parchment. Slice the log crosswise 1/4 inch thick; arrange the slices about 1 1/2 inches apart on the baking sheets. Bake, switching the position of the pans halfway through, until slightly puffed and lightly golden on the bottom, 12 to 15 minutes. Let cool 5 minutes on the baking sheets, then transfer to rack to cool.
* I could not find cinnamon extract, but did find cinnamon oil at Hobby Lobby in the cake decorating department. It is stronger by 4. I used 1/16th of a teaspoon. To be honest, I don’t think you need it.