Whisk PB2 and whey protein into almond milk until smooth. Add oats, 1 tbsp of peanut butter, cinnamon, and chia seeds and stir until combined.
Layer oats and sliced bananas in a resealable jar or container. Refrigerate overnight.
Serve chilled or reheat for 1 to 1 1/2 minutes before serving. Top with remaining melted peanut butter before serving.