Combine oats, protein powder, almond milk, cocoa powder, maple syrup, vanilla, and sea salt into a bowl or jar. Stir well to combine until all the protein powder has dissolved, creating a smooth mixture.

Securely seal the container with a lid, then place it in the fridge overnight.

The next morning, take the container out of the fridge and give it a good stir. If you prefer a creamier texture, feel free to add a splash more almond milk.

Portion the overnight oats into two bowls or containers. Top each with chocolate chips, chopped walnuts, and peanut butter if you're using it. Enjoy your delectable breakfast!