In a sealable mason jar or container, combine almond milk, Greek yogurt, rolled oats, protein powder, chia seeds, vanilla extract, and mashed banana. Stir until well combined.
Choose your preferred flavor from the options provided (e.g., pumpkin puree for pumpkin flavor) and stir in the additional ingredients.
Seal the jar tightly and refrigerate overnight or for at least 6 hours.
When ready to serve, add more almond milk if desired and any toppings like fresh fruit or nuts.
