Preheat the oven to 350 F.

Combine the chia seeds and water in a small bowl and set aside until it becomes gelatinous.

Add the chia seed mixture, oats, banana, almond milk, maple syrup, baking powder and vanilla extract to a blender and blend until smooth.

Pour the mixture into one small casserole dish or two oven-proof ramekins.

Add a spoonful of almond butter and gently push it into the center of the oat mixture. Top with frozen berries.

Bake for 30 minutes or until a toothpick is inserted and comes out clean.