Cook the apple: Melt the butter in a small skillet over medium heat. Add the diced apple, 1/4 teaspoon cinnamon, and 3-4 tablespoons of water. Cook for 4–5 minutes, stirring occasionally, until the apple is tender and the water has evaporated. Continue cooking for another 1–2 minutes, until the apples are lightly caramelized. Remove from the heat and let cool slightly.
Make the overnight oats: In a jar or container, combine the rolled oats, chia seeds, ¼ teaspoon cinnamon, and a pinch of salt. Add the milk, yogurt, maple syrup, and vanilla extract. Stir well until evenly combined.
Add the apples: Stir about half of the cooked apples into the oat mixture and spoon the remaining apples on top.
Chill: Cover and refrigerate for at least 4 hours, preferably overnight, until the oats are soft and creamy.
Serve: Stir before serving. If the oats are thicker than you like, add a splash of milk or yogurt. Enjoy cold or gently warm them before serving.
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Notes
Sweetener: Maple syrup is optional and can be adjusted to taste. Start with 1 tablespoon and add more if you prefer sweeter overnight oats. Honey, agave, or another sweetener can also be used. The sweetness will also depend on the apple variety you use.
Yogurt: Greek yogurt makes the oats thicker, creamier, and higher in protein. Regular plain yogurt also works and gives a slightly softer consistency. Use vegan yogurt for a vegan version.
Milk: Use any milk you like, including dairy milk, almond milk, oat milk, soy milk, or another plant-based milk. Different milks may slightly change the thickness, so add an extra splash before serving if needed.
Butter: Butter gives the apples a richer, more classic apple-pie flavor. Coconut oil works well for a dairy-free version. You can also cook the apples without added fat, using a little extra water, although they won't caramelize quite as much.
Spices: Cinnamon keeps the flavor simple, but you can add a pinch of nutmeg, ginger, allspice, or apple pie spice for a warmer, more pronounced apple-pie flavor.
Consistency: Overnight oats naturally thicken as they chill because both the oats and chia seeds absorb liquid. For thinner oats, stir in a little extra milk before serving. For thicker oats, slightly reduce the milk.
Storage: Store covered in the refrigerator for up to 3-4 days. The apples will soften further as they sit, so the texture is best within the first 1–2 days.
Meal prep: You can multiply the recipe and prepare several jars at once. Divide the oat mixture and cooked apples evenly between containers before refrigerating.
Protein and fiber. Each serving provides about 17g protein and 11g fiber when made with whole milk and Greek yogurt. Different milk or yogurt choices will change these amounts.