In a medium bowl, stir together oats, chia seeds, milk, maple syrup, and cinnamon. Cover and refrigerate until thickened, at least 8 hours and up to 3 days.
To serve, layer oat mixture, yogurt, mango, raspberries, and almonds into glass cups or jars. Top with more syrup, if desired. Serve immediately or cover and refrigerate for up to 1 day.
