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Preheat oven to 350 degrees and grease a 12-cup muffin tin well (I used baking spray).
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In a bowl, mix oats, peanut butter, banana, maple syrup, egg, milk, cinnamon, salt, baking powder, and vanilla extract together.
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Add in chocolate chips, and mix until combined.
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Pour oatmeal into each muffin cup, about 3/4 of the way full.
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Bake for 23-25 minutes, or until the oatmeal cups are golden brown and set.
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Serve immediately (plain or with milk, maple syrup, and/or honey), or allow to cool completely before storing in the fridge in an airtight container.
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Enjoy!