Combine rolled oats, unsweetened almond milk, vanilla Greek yogurt, chia seeds, maple syrup, vanilla extract, and mashed banana in a jar or container.

Stir vigorously until fully incorporated, ensuring chia seeds are evenly distributed.

Seal the jar and refrigerate for at least 4-6 hours or overnight.

In the morning, stir the mixture and adjust consistency with almond milk if needed.

Add toppings of crushed graham crackers, banana slices, and optionally whipped topping.

Serve directly from the jar or in a bowl and enjoy!