Step 1. Prep the Oven and Pan
Preheat oven to 350°F. Line a baking sheet with parchment paper.
Step 2. Mix Dry Ingredients
In a bowl, whisk together gluten-free flour, baking soda, and salt.
Step 3. Cream Butter and Sugar
In a separate bowl, beat butter and sugar until light and smooth. Add egg and vanilla, mixing until combined.
Step 4. Combine the Dough
Gradually mix dry ingredients into the wet ingredients until a soft dough forms.
Step 5. Prepare the Blueberries
Toss blueberries with cornstarch to prevent excess moisture, then gently fold into the dough.
Step 6. Shape the Cookies
Scoop dough onto the prepared baking sheet, spacing cookies about 2 inches apart.
Step 7. Bake
Bake for 12–14 minutes until edges are set and centers look slightly soft.
Step 8. Cool
Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack.
