Step 1: Preheat Oven and Prepare Baking Sheet: Preheat the oven to 375F (190C). Line a baking sheet with parchment paper. This prevents sticking and ensures easy cleanup.
Step 2: Whisk Dry Ingredients: In a medium bowl, whisk together the gluten-free flour, baking soda, cinnamon, and salt. Ensure ingredients are evenly distributed.
Step 3: Cream Butter and Sugars: In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy. This step is crucial for a tender cookie.
Step 4: Add Egg and Vanilla: Beat in the egg and vanilla extract until well combined. The mixture should be smooth and creamy.
Step 5: Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix, as this can result in tough cookies.
Step 6: Fold in Oats and Raisins: Gently fold in the gluten-free rolled oats and raisins until evenly distributed throughout the dough.
Step 7: Drop Dough Onto Baking Sheet: Drop rounded tablespoons of dough onto the prepared baking sheet, leaving about 2 inches between each cookie.
Step 8: Bake: Bake for 12-15 minutes, or until the edges are golden brown and the centers are set.
Step 9: Cool: Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
Optional Tips: For a chewier cookie, substitute melted coconut oil for half of the butter. Chopped nuts, such as walnuts or pecans, can be added for extra flavor and texture.