1. Prep Your Oven: Preheat your oven to 350°F (175°C) and lightly grease an 8x8 inch baking dish with coconut oil or cooking spray.
2. Make Oat Flour: Take half of your rolled oats and pulse them in a high-speed blender until they become a fine flour. Keep the other half of the oats whole for a lovely texture.
3. Combine Dry Ingredients: In a large mixing bowl, whisk together the oat flour, whole rolled oats, baking powder, salt, cocoa powder, and protein powder. Mix until everything is well distributed.
4. Mix Wet Ingredients: In a separate medium bowl, whisk together the almond milk, eggs, melted coconut oil, and maple syrup until smooth.
5. Combine Wet & Dry: Pour the wet ingredient mixture into the bowl with the dry ingredients. Stir gently with a spoon or spatula until everything is just combined and there are no dry spots. Be careful not to overmix!
6. Add Chocolate Chips: Fold in most of your dark chocolate chips, reserving a small handful to sprinkle on top later.
7. Pour & Top: Transfer the oat batter evenly into your prepared baking dish. Smooth out the top and sprinkle with your reserved chocolate chips.
8. Bake to Perfection: Bake for 28-33 minutes, or until the edges are lightly golden and the center feels mostly set (it will firm up more as it cools). A toothpick inserted near the center should come out mostly clean with maybe a few gooey chocolate smears.
9. Cool & Serve: Let the baked oatmeal cool slightly in the dish before slicing into squares. Enjoy warm as is, or with a drizzle of peanut butter, a dollop of Greek yogurt, or even a scoop of dairy-free ice cream for a dessert-like treat!