Overnight oats are a no-cook method of making oatmeal. Instead of cooking your oats with liquid on the stove or in the microwave, you mix rolled oats with the liquid and other mix-ins, and let it rest in the fridge overnight.
In the morning, you have a pudding-like porridge that is perfect for easy grab-and-go breakfasts. It doesn’t have the same texture as hot/stove-top oats. It’s creamier, denser, and in my opinion, so much tastier.