In a small pot, combine the oats and milk (or water). Cook over medium heat, stirring occasionally, until the oats are creamy and thickened (about 5 minutes).
Remove the pot from heat and stir in the protein powder. Mix well until smooth.
Serve the oatmeal into a bowl. Add your favorite toppings, such as peanut butter, chia seeds, fresh berries, or sliced fruit.
Notes
If the mixture is too thick after adding the protein powder, add a splash of milk or water to reach your desired consistency.