Unlike a bowl of warm oatmeal, overnight oats are meant to be eaten cold, straight from the refrigerator (no reheating necessary). To make them, you’ll soak rolled oats in milk and yogurt overnight, which gives them a soft, slightly toothsome texture that’s ultra-creamy and subtly sweet. Because you’ll be using rolled oats, which are already pre-cooked, allowing the oats to soak in a liquid overnight is enough to soften the grain to the same texture as would cooking.