01 - Preheat the oven to 350°F and line a 12-cup muffin tin with paper liners or grease lightly with cooking spray.
02 - In a large bowl, mash the bananas until smooth. Whisk in eggs, Greek yogurt, honey, oil, and vanilla extract until well combined.
03 - In a separate medium bowl, whisk together the whole wheat flour, baking soda, baking powder, cinnamon, and salt until evenly distributed.
04 - Gradually add the dry ingredients to the banana mixture and stir until just combined—do not overmix to avoid dense muffins.
05 - Gently fold in the chopped nuts and optional chocolate chips until evenly distributed throughout the batter.
06 - Divide batter evenly among the 12 muffin cups, filling each cup about 3/4 full.
07 - Bake for 18 to 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.