Gluten Free Baked Oatmeal Casserole

Name: Gluten Free Baked Oatmeal Casserole
Prep time: 10 min
Cook time: 40 min
Total time: 50 min
Cuisine: American
Ingredients: 2 cups gluten-free rolled oats; 1/3 cup brown sugar; 1 teaspoon baking powder; 1 teaspoon cinnamon; 1/2 teaspoon salt; 1 cup walnut pieces; 1 cup raspberries {any berries work}; 1/2 cup milk chocolate chips; 2 cups almond milk; 3 tbsp ground flaxmeal (or ground chia); 3 tablespoons earth balance butter, melted; 1 tablespoon vanilla extract; 1 ripe banana, peeled, 1/2-inch slices