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 and uniform.
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 with a spatula until just combined—do not overmix to ensure tender muffins.
05 - Gently fold in the chopped nuts and optional chocolate chips until evenly distributed throughout the batter.
06 - Divide batter evenly among the muffin cups, filling each about 3/4 full to allow for proper rising during baking.
07 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center comes out clean and the tops are golden brown.
08 - Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving or storing.