
Preheat oven to 350°F (177°C) and grease an casserole dish with gluten-free cooking spray.
In a large bowl, combine the gluten-free cornmeal, gluten-free flour, baking soda, baking powder, salt, and sugar.
Add in the drained can of corn, the cream of corn, sour cream, and the melted butter. Mix until fully combined.
Pour into a greased casserole dish.
Bake uncovered on the midle oven rack for 45-50 minutes.
Allow to cool for 5-10 minutes before serving.