1. 1. Combine Dry Ingredients: In a medium-sized jar or container with a lid (a 16-ounce mason jar works perfectly), add the rolled oats, protein powder, chia seeds, and a pinch of salt. Stir these dry ingredients together thoroughly with a spoon to ensure the protein powder is evenly distributed and doesn’t clump.

2. 2. Add Wet Ingredients: Pour in the unsweetened almond milk and add the Greek yogurt to the jar. If you’re using maple syrup or honey for sweetness, add it now.

3. 3. Mix Everything Together: Stir all the ingredients vigorously until they are well combined and there are no dry spots remaining. Make sure to scrape the bottom and sides of the jar to incorporate everything. The mixture will look a bit liquidy at this stage, but the chia seeds and oats will absorb the liquid overnight.

4. 4. Fold in the Berries: Gently fold in the mixed berries. If using frozen berries, they will thaw and release some of their juices as the oats chill, adding more flavor and moisture.

5. 5. Seal and Chill: Place the lid securely on the jar or container. Transfer it to the refrigerator and let it chill for at least 4 hours, though overnight (about 8 hours) is ideal for the best texture and flavor development. The oats will soften, and the mixture will thicken considerably.

6. 6. Serve and Enjoy: In the morning, give the oats a quick stir. If they are too thick for your liking, you can add a splash more milk to reach your desired consistency. Serve cold, straight from the jar, and enjoy your healthy, high-protein breakfast!