Blend together oat milk, protein powder, peanut butter, maple syrup, and vanilla extract.
Add oats to a jar along with chia seeds and the liquid. Mix to combined. Cover and place in the fridge overnight.
In the morning, whisk together 1 scoop of the peanut butter powder with oat milk until you get a runny consistency similar to organic peanut butter. Top overnight oats with sliced bananas, the peanut butter powder mixture, and hemp hearts before serving.