Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with liners or grease well.
In a large bowl, whisk flour, baking powder, baking soda, salt, and cinnamon.
2 cups All Purpose Flour, 1 teaspoon Baking Powder, ½ teaspoon Baking Soda, ½ teaspoon Salt, ½ teaspoon Ground Cinnamon
In a separate bowl, whisk mashed bananas, eggs, sugars, oil, Greek yogurt, peanut butter, and vanilla until smooth.
1 cup Ripe Bananas, 2 large Eggs, ½ cup Brown Sugar, ¼ cup Granulated Sugar, ¼ cup Canola Oil, ½ cup Greek Yogurt, ½ cup Peanut Butter
Add wet ingredients to dry and fold gently until just combined. Avoid overmixing. Fold in any optional mix-ins.
⅓ cup Chopped Peanuts
Divide batter evenly among muffin cups. Bake 18–22 minutes, until a toothpick inserted into the center comes out clean.
Cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.