In a large airtight jar or bowl, combine rolled oats, chia seeds, Greek yogurt, and your choice of protein powder (if using). Pour in freshly squeezed orange juice, mixing all the ingredients until they are thoroughly combined and well incorporated.

Fold in the diced oranges to your creamy mixture, ensuring they're evenly distributed throughout.

Cover the jar tightly with a lid and place it in the refrigerator. Let it chill for at least 4 hours or overnight.

When ready, take it out of the fridge and give it a good stir. If too thick, add a splash of milk or more orange juice.

Spoon the Orange Overnight Oats into a bowl or enjoy straight from the jar. Top with additional diced oranges, nuts, honey, or nut butter.