Make the base recipe: In a Mason jar or other lidded jar, place the oats, chia seeds, maple syrup, salt, and Greek yogurt, if using. Add the almond milk and stir until the mixture is well combined and there are no clumps of chia seeds at the bottom of the jar. Cover and refrigerate overnight, or for up to 5 days.
In the morning, top with your desired toppings and serve with drizzles of maple syrup.