Add and combine the blueberries, lemon zest, white sugar, and lemon juice in a bowl and set aside.
Cake Batter:
Add and combine the white rice flour, tapioca flour, oat flour, xanthan gum, baking powder, salt, ground cinnamon, vanilla extract, granulated white sugar, and milk.
Brush the bottom of a casserole with vegetable oil, then pour the blueberry filling and spread it evenly across the bottom of the casserole. Then, pour the cake batter mix on top of the blueberries.
Bake the gluten free blueberry cobbler for 40 minutes or until the cobbler is crisp and golden. Top the cobbler with vanilla ice cream and serve.
Notes
Blueberry cobbler is best served warm and straight out of the oven. Storing or freezing blueberry cobbler is not recommended as the dough will lose its consistency and crispiness.
Dairy-Free Option: Substitute full-fat dairy milk with almond or coconut milk.