Overnight oats are easiest when they are more creamy than chewy. Yogurt and milk soften the oats overnight, while grated apple disappears into the mixture and gives it a gentle sweetness. Keep the diced apple and pecans for the morning so the topping stays crisp.
The texture trick
Use old-fashioned rolled oats rather than instant oats, which can go pasty. A small spoonful of chia seeds thickens the mixture without making it gummy. Stir once before refrigerating and again before serving; if it looks too thick, add a splash of milk.
Prep several jars at once
Mix the base in a bowl, divide it between jars and refrigerate at least six hours. The base keeps for up to three days in the fridge. Toss the diced apple with a squeeze of lemon and add it just before eating, along with toasted pecans. For a warm bowl, gently heat the oat base and add the toppings after.
Sweetness and swaps
Apples vary, so taste the base before adding maple syrup. If the apple is very sweet, you may need none. Pear works in the same proportion; walnuts can replace pecans. Use a dairy-free yogurt and milk if you need a dairy-free version.
Keep the fresh topping separate
Grated apple mixes throughout the oats; diced apple adds a different texture on top. Add the diced topping and nuts close to serving so they retain more crunch.
Chia seeds absorb liquid as the mixture rests. Stir before serving and add a little milk if the oats are thicker than you like. Start with less maple syrup, particularly when the apple is sweet.
Can I use steel-cut oats?
Not as a direct replacement in this method. Steel-cut oats remain firmer and need a different preparation. Use rolled oats for the stated recipe; instant oats can produce a softer result.
More recipes to try
Editorial note: RecipeLeaf has not independently kitchen-tested this recipe. Preparation times and yield are estimates; use visual doneness cues and applicable food-safety guidance. The featured image is an illustrative representation.