Everything you need to know for how to make Overnight Oats plus 10 Flavors! This super easy make-ahead breakfast for busy mornings is perfect for meal prep. It’s gluten-free and you’ll find my dairy-free tips below as well. Overnight oats are typically served cold, but you can warm them up too. The 10 flavor recipe variations are all based off dessert flavors, which means you can eat a healthy breakfast that tastes like you’re having dessert!