Combine oats, milk, yogurt, maple syrup, lemon zest, and salt in a mason jar (or small bowl). Mix well.
Stir in half the blueberries, then top with remaining berries.
Cover and refrigerate overnight (or at least four hours) before eating. Enjoy!
Notes
Best Yogurt - Plain yogurt works best here, although you can use Greek yogurt if you prefer. Just make sure add an extra tablespoon or two of milk, otherwise the recipe won't have enough liquid and the oats will turn out gummy.Best Milk - Any kind of milk works, although 2% or whole will give you the creamiest results. For vegan oats, use plant based milk (such as almond, oat, or soy milk) and yogurt. You can even use water for a no milk variation. Multiple Servings - To make multiple servings at one time, line up jars on your counter. Then measure and add the ingredients assembly line-style. Mix and refrigerate as directed.More Tips + Tricks - Check out the info before this recipe card for more tips, topping ideas, and variations!