Prepare for baking. Preheat your oven to 375ºF. Spray an 8-inch square baking dish with cooking spray.
Make the compote. Combine ¼ cup of blueberries, ¼ cup of blackberries, maple syrup, water, and lemon juice in a saucepot. Simmer over medium heat, stirring, for 8 minutes. Add the remaining blueberries and vanilla extract, and cook for 6 minutes, stirring occasionally. Remove the compote from the heat. The compote will thicken as it cools down. Set it aside.
Mix the wet ingredients. In a large bowl, whisk milk, almond butter, eggs, date syrup, coconut oil, vanilla extract, cinnamon powder, and salt.
Add the oats and protein powder. Stir in the rolled oats and vanilla protein powder. Make sure it is well combined. Let the mixture stand for 5 minutes.
Assemble. Pour the oatmeal into the baking dish and top it with dollops of berry compote and any cooking juices.
Bake. Bake the oatmeal for 35-40 minutes or until the center is set.
Cool and serve. Remove the oatmeal from the oven and cool it completely before slicing and serving. Ideally, cool it overnight in the fridge for clean slices. You can drizzle the baked oatmeal with some extra almond butter before serving.
Notes
Do not use instant or quick cooking oats, as you will not end up with the same results.
If you do not feel like making berry compote, just stir some fresh berries with your oatmeal and add some on top.
For extra crunch, you can add chopped pecans to or on top of your oatmeal.
If you do not have date syrup, use maple syrup or a desired sweetener.
Allow the oats batter to rest for a few minutes before baking so it can soak up some of the liquid.