Combine all ingredients except the toppings in a small container.
Cover the container with a lid and place in the refrigerator overnight.
Take out of the refrigerator in the morning and stir.
Top with mixed berries.
Notes
Tip: If you don't have protein powder on hand, here are some other ways to add protein to your overnight oats:
Greek Yogurt: Add ¼ cup of plain Greek yogurt to the overnight oats mixture. This will add about 4 grams of protein, depending on what brand you use.
Cottage Cheese: Add ¼ cup of cottage cheese to the overnight oats mixture. This will about around 7 grams of protein.
Nuts and Nut Butter: Chopped nuts and/or nut butter are a great way to add a little bit of extra protein to your overnight oats. They also add healthy fats, which will make the oats even more filling!