Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners.
Mash the bananas in a large bowl until smooth.
Add the eggs, Greek yogurt, peanut butter, honey, and vanilla. Mix until well combined.
Stir in the oats, baking powder, and cinnamon until evenly distributed. Let the batter rest for 5 minutes so the oats absorb moisture.
Divide batter evenly among the 12 muffin cups.
Bake for 20–22 minutes until the tops are set and a toothpick comes out clean.
Cool in the pan for 5 minutes, then transfer to a wire rack. Store in the fridge for up to 5 days.
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