Homemade Gluten-Free Blueberry Cookies with Jammy Centers - Quickie Treats

Ingredients

• 1 cup frozen blueberries
• 2 cups multipurpose gluten-free flour (with xanthan gum)
• 1 ½ tablespoons cornstarch
• 1 ½ teaspoons baking powder
• ½ teaspoon kosher salt
• 2 heaping tablespoons cornstarch mixed with 3 tablespoons water
• ½ cup unsalted butter or vegan baking stick, room temperature
• 1 ¼ cups granulated sugar
• 2 tablespoons milk
• 2 tablespoons granulated sugar