Preheat oven to 375 degrees and lightly spray an 8-inch baking dish with non-stick cooking spray.
In a large bowl, combine the almond milk, protein powder, flax seeds, chia seeds, cinnamon, agave/maple syrup, salt, vanilla and baking powder and whisk together.
In a small bowl mash banana and mix with peanut butter, then add to the to the wet mixture and whisk until blended well.
Add the oats to the mixture and mix together with a rubber spatula or wooden spoon.
Add half of the berries and fold into mixture, very lightly. Over mixing will color the baked oats.
Pour mixture into prepared pan and sprinkle the top of the oats with the remaining berries.
Place pan in oven and bake for 45 minutes or until set.
Once the mixture has cooled, slice and serve with maple syrup, agave and a little almond milk or however you like! I like to warm my slice up in the microwave for 15-30 seconds! YUM!