To a small pot, add oats, milk, water, cinnamon, and salt. Stir.
Turn the heat to medium.
Wait about 5-minutes until your milk starts to steam and warm up -- things move quickly from here, so stay near the stove.
As soon as you notice small bubbles start to form, stir frequently for about 2-minutes. Keep stirring until most (but not all) liquid is absorbed and the oats are cooked, but still chewy.
Remove your pot from the heat and let them cool for 2-minutes.
Stir in protein powder until combined and smooth.
Immediately transfer oats to your serving bowl and add toppings of choice. Enjoy!