Combine: Place all ingredients (besides those for the topping) in a container and stir until well combined. Seal with a lid and place in the fridge overnight.
Prepare the crumble: Combine all ingredients for crumble in a small bowl. Set aside. (This can be done the night before as well.)
Serve: Bring out of the fridge in the morning and stir. You'll notice that the protein powder, oats and chia seeds soak up a lot of the liquid so you may want to add a little more almond milk before serving. Portion overnight oats into two containers, top each with the crumble topping and a few extra blueberries. I also did a drizzle of almond butter! Enjoy.
Video
Notes
Crumble topping substitute: No time to make the crumble topping? Simply top the oats with granola instead.