Geode Cookies

Directions

1. In a large bowl, beat the butter and sugar together until light and fluffy, about 2 minutes. Add eggs and milk and beat until just incorporated. Add remaining ingredients (except the food coloring) and mix until the dough is well incorporated.
2. Divide dough in half. Add purple food coloring to one half until you have reached your desired intensity. Divide remaining white dough in half again, leaving one part white and dying the other black.
3. On a clean, floured surface, roll out the black cookie dough into a 6x12-inch rectangle. Roll out the white cookie dough into the same size, place on top of the black dough, and lightly roll to adhere them together. Next, roll out the purple dough into the same size (it will be thicker). Spread 3 tablespoons of purple sprinkles over the dough leaving an inch border, press to adhere to the dough, and roll up into a log.
4. Place on top of the stacked black and white dough, and roll up around the purple dough, encasing it and squeezing lightly to adhere the dough together into a large log. Roll log in black sprinkles, wrap in plastic wrap, and chill in fridge for at least 1 hour.
5. Preheat oven to 375 degrees F. Line a cookie sheet with parchment or a silicone baking mat.
6. Remove chilled cookie dough from wrapper and cut into 1/4-inch thick slices. Place 2 inches apart on prepared cookie sheet, sprinkle center with additional purple sprinkles, and bake for 10 minutes or until they begin to brown. Remove from the oven and cool 10 minutes before transferring to a wire rack.