01 - Preheat oven to 350°F. Line a standard 12-cup muffin tin with paper liners or lightly coat with nonstick spray.
02 - In a large mixing bowl, whisk together mashed bananas, eggs, peanut butter, honey or maple syrup, applesauce, milk, and vanilla extract until thoroughly combined.
03 - In a separate bowl, blend rolled oats, whole wheat flour, baking powder, baking soda, salt, and ground cinnamon if using.
04 - Add dry ingredients to the wet mixture and stir gently until just combined. Avoid overmixing to maintain tenderness.
05 - Fold in mini chocolate chips or chopped nuts, if desired, for additional texture.
06 - Divide batter evenly among prepared muffin cups, filling each cavity about three-quarters full.
07 - Place muffin tin in the center rack of the oven. Bake for 18 to 22 minutes, or until a toothpick inserted in a muffin’s center emerges clean.
08 - Allow muffins to rest in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving or storing.