01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease lightly with cooking spray.
02 - In a large mixing bowl, mash bananas until smooth. Whisk in eggs, Greek yogurt, honey, oil, and vanilla extract until fully incorporated.
03 - In a separate medium bowl, whisk together whole wheat flour, baking soda, baking powder, cinnamon, and salt until well blended.
04 - Gradually add dry ingredients to the banana mixture. Stir gently until just combined—do not overmix as this will result in dense muffins.
05 - Gently fold in chopped nuts and optional chocolate chips using a spatula, taking care not to overmix the batter.
06 - Divide batter evenly among the prepared muffin cups, filling each approximately 3/4 full.
07 - Bake for 18-22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
08 - Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving or storing.