In a medium bowl, combine the oats, milk, maple syrup, vanilla extract, cinnamon, and a pinch of salt. Stir well.
Divide the mixture between two mason jars or airtight containers.
Cover and refrigerate for at least 4 hours or overnight.
In the morning, slice the banana. Top each jar with banana slices.
Stir and enjoy cold, or microwave for 1-2 minutes if you prefer it warm. Add a splash more milk if too thick.
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