In a 10 oz mason jar or glass container, combine graham cracker crumbs and milk. Press the mixture into the bottom of your mason jar to form the crust.

In a medium bowl, add mashed banana, milk, maple syrup, vanilla Greek yogurt, and vanilla extract. Whisk until smooth. Add oats, chia seeds, and protein powder. Mix well. Pour the oat mixture over the graham cracker crust. Cover and place in the fridge to chill for at least 3 hours (ideally overnight).

In the morning, top with the remaining 2 tablespoons of vanilla Greek yogurt and finish with additional sliced bananas or crushed graham cracker crumbs if desired.