In a mixing bowl or jar, combine rolled oats, almond milk, Greek yogurt, chia seeds, maple syrup (if using), and ground cinnamon. Stir well to ensure all ingredients are evenly distributed.

Dice half an apple into small pieces. Toss the diced apple with lemon juice and brown sugar (if using) in a small bowl to prevent browning and add a hint of sweetness.

Fold half of the diced apple into the oat mixture to infuse it with fruity flavor.

Transfer the oat mixture to a jar or airtight container. Top with a drizzle of caramel sauce and the remaining diced apple.

Cover the container and refrigerate overnight (or for at least 6 hours) to allow the oats to soften and absorb the flavors.

When ready to serve, give the oats a good stir. Add another drizzle of caramel sauce on top and sprinkle with crushed nuts (optional) for added texture.

Enjoy cold straight from the fridge or warm briefly in the microwave for 30–60 seconds if desired.