Get Ready: Preheat your oven to 350°F (175°C) and lightly grease an 8x8 inch baking dish.
Mix Your Dry Goods: In a large bowl, whisk together the rolled oats, blended oat flour, baking powder, protein powder, salt, and cinnamon until well combined. This keeps it light and fluffy!
Combine Your Wet Goods: In a separate bowl, whisk the unsweetened almond milk, eggs, melted butter (or coconut oil for a dairy-free option), pure maple syrup, and pure vanilla extract until smooth.
Bring It All Together: Pour the wet mixture into the dry ingredients and stir gently until just combined. Fold in most of the dark chocolate chips, saving a small handful for the top.
Time to Bake: Pour the oatmeal mixture evenly into your prepared baking dish. Sprinkle the reserved chocolate chips over the top for extra gooey goodness. Bake for 30-35 minutes, or until the edges are golden and the center is set.
Cool and Enjoy: Let the baked oatmeal cool for 5-10 minutes before slicing. It's delicious warm out of the oven or can be stored for a quick, healthy breakfast later!