Step 1: Craft the Cinnamon Swirl Bites In a small bowl, combine the softened butter, brown sugar, and ground cinnamon. Mix until you get a thick, sweet paste. Roll this mixture into small, marble-sized balls (about ½-inch in diameter). Place them on a parchment-lined baking sheet and freeze them for at least 30 minutes until they're nice and firm. This is key for those delightful, gooey cinnamon pockets!
Step 2: Prepare the Light Cookie Dough In a large mixing bowl (using a hand mixer or stand mixer), beat the softened butter and white sugar together until the mixture is light and wonderfully fluffy. Stir in the room-temperature eggs and vanilla extract, mixing until everything is smoothly combined. In a separate bowl, whisk together the gluten-free all-purpose flour, baking soda, sea salt, and cream of tartar. Gradually add these dry ingredients to the wet mixture, mixing slowly until a soft, consistent dough forms. Once your cinnamon swirl bites are frozen solid, gently fold them into the cookie dough on a low speed until they are just distributed throughout.
Step 3: Roll and Coat for a Sunny Finish In a small, clean bowl, mix together the white sugar and ground cinnamon for your irresistible coating. Scoop out about 2 tablespoons of cookie dough for each cookie and roll it into a smooth ball. Roll each dough ball generously in the cinnamon sugar mixture until it’s fully coated and shimmering. Place these coated dough balls on a parchment-lined baking sheet, ensuring about 2-3 inches of space between each cookie.
Step 4: Bake to Golden Summer Perfection Preheat your oven to 350°F (175°C). Bake the cookies for 11-12 minutes. You’re looking for edges that are just set and slightly golden; avoid over-baking to keep them perfectly soft and chewy. Let the cookies cool on the baking sheet for a few minutes before carefully transferring them to a wire rack to cool completely. Serve these easy, gluten-free cinnamon swirl cookies as a perfect summer treat!