Add the oats and boiling water into a mixing bowl. Allow to sit for 10 - 15 minutes.
Meanwhile, mash the banana in a separate bowl until as smooth as possible. Stir in the flax egg, syrup and protein powder. Pour this mixture over the softened oats and stir to combine.
Add the remaining ingredients into the bowl and stir again to combine.
Pour the oat mixture into a 9x13 baking pan. Top with sliced bananas and more blueberries if desired.
Bake at 350ºF for 30 - 35 minutes. Allow to cool slightly, then cut into squares (or scoop out) and enjoy.
Video
Notes
Store baked oatmeal in the refrigerator for up to 6 days, or freeze it for up to 3 months.