Combine the oats, cottage cheese, and apple cider in a jar or airtight container. Stir until evenly mixed.
Add the almond butter, chia seeds, diced apple, cinnamon, and nutmeg. Stir well to distribute — the almond butter will be streaky, that's fine. It incorporates as it sits.
Cover and refrigerate overnight or for at least 6 hours.
Before serving, top with diced apple, chopped walnuts, and a drizzle of maple syrup. Eat cold or at room temperature.
Notes
Blend the cottage cheese smooth before mixing if you prefer no visible curds.
Apple cider (not apple cider vinegar) is the liquid here — it adds a subtle apple sweetness to the base. Substitute milk if you can't find it.
Keeps refrigerated up to 3 days. Add toppings fresh each morning.