Instructions

1. In the bowl of a stand mixer, whisk together the flours, starches, xanthan gum, baking powder, salt, confectioners' sugar, and granulated sugar.
2. With the paddle attachment, slowly beat in the butter until the dough starts to come together. Add the beaten egg and vanilla and mix until the dough is evenly blended.
3. Use a scale and weighed all the dough, then placed half of it back into the bowl (or eye ball it, but try to be accurate). To the dough in the bowl, add strawberry extract (or other extract, mint would be wonderful at Christmas as well) and colouring. Add 1 tablespoon rice flour and mix until well blended.
4. Roll each colour of dough out between sheets of waxed paper, until the dough is a rectangle, measuring approximately 11" x 9", and about 1/4" thick. Remove the top sheet of waxed paper from each piece of dough.
5. Carefully lift one rectangle, and using the waxed paper to help you, turn it over on top of the other rectangle of dough. Gently rub on the top of the waxed paper, to help the two layers stick together. Use a sharp knife to cut the edges of the dough to make a rectangle, this will make it easier to roll the dough into a log.
6. If the dough feels too soft, refrigerate it on a baking sheet for 30 minutes. Remove from fridge and allow to become pliable again before attempting to roll up. Carefully roll the dough up along the long side, similar to a cinnamon roll. Try to keep the rolls as tight as possible, or you will have a hole in the middle of your cookies. Continue rolling & running your hands over the dough to ensure it is not cracking. Use the waxed paper to help you roll the dough into a circle.
7. Place the sprinkles in a baking sheet, and roll the log of cookie dough in the sprinkles, until the entire outside of the dough is coated in the sprinkles.
8. Tightly wrap cookie dough in plastic wrap and refrigerate for at least one hour.
9. Preheat oven to 350 degrees F and line your baking sheets with parchment paper.
10. Remove your cookie dough from the fridge, unwrap, and using a sharp knife, cut into 1/4" slices. Place slices on prepared baking sheet, leaving 2" between cookies. Re-wrap and refrigerate dough until you are ready to prepare another pan for baking.
11. Bake in preheated oven for 13-15 minutes, or until the edges are just slightly golden brown. Allow to cool on cookie sheets for a few minutes before transferring to cooling racks. Allow cookies to cool completely before storing in air-tight containers.