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Preheat the oven to 350* F. Line a muffin pan with paper liners and set aside.
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In a medium bowl, whisk together flour, baking powder, baking soda, salt, and cinnamon. Set aside.
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Place the mashed bananas in the bowl of a stand mixer. Add the brown sugar, honey, oil, egg, vanilla and beat until combined. Add in the peanut butter and beat until smooth.
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Add the flour mixture and milk alternately. Mix until just combined. Don't over-mix.
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Fill muffin liners three-quarters full.
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Cook until a toothpick inserted into center comes out clean, about 20-22 minutes.
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Transfer to wire rack to cool at least 10 minutes before eating.