Choose your container: A mason jar or airtight container works best.
Layer the ingredients: Start with ½ cup rolled oats, then add ½ cup milk, ¼ to ½ of a chopped apple, ¼ tsp cinnamon, and a sweetener if using.
Add mix-ins: Stir in 1 tbsp chia seeds, a splash of vanilla, and any optional extras like yogurt or nut butter.
Stir or shake: Mix well so the oats are evenly coated.
Refrigerate: Let the oats sit overnight, or for at least 4–6 hours.
Enjoy cold or warm: In the morning, eat them straight from the jar, or microwave for 30–60 seconds for a warm breakfast.
Pro tip: Add toppings like a drizzle of almond butter or a sprinkle of granola just before serving for texture and flavor.