Prepare the base: In a large mixing bowl or jar, combine the rolled oats, protein powder, chia seeds, cinnamon, and a pinch of salt. Stir the dry ingredients well to ensure the protein powder is evenly distributed.
Add wet ingredients: Pour in the milk, then add the Greek yogurt and nut butter. Mix slowly at first to break up the protein powder clumps, then stir thoroughly until you have a smooth and creamy mixture. If you prefer extra sweetness, drizzle in honey or maple syrup at this stage.
Rest and thicken: Cover the bowl or seal the jar with a lid. Place in the refrigerator for at least 6 hours or preferably overnight. This allows the oats and chia seeds to soak up the liquid, creating a thick, pudding-like texture.
Check consistency: In the morning, give the oats a good stir. If the mixture seems too thick, add a splash of extra milk to loosen it up. If it’s too thin, you can mix in more yogurt or a few spoonfuls of oats and let it sit for 10–15 minutes before serving.
Serve and enjoy: Spoon into bowls or enjoy straight from the jar. Top with your favorite fruits like berries, banana slices, or apple chunks. You can also sprinkle on nuts, seeds, or a handful of granola for extra crunch.