Preheat your oven to 375°. In a large bowl, mash your bananas until almost smooth.
Add eggs, carrots, maple syrup, avocado oil, vinegar, and vanilla. Mix until well combined.
Add whole wheat pastry flour, cinnamon, baking soda, baking powder, and salt. Mix until just combined, but try not to overmix.
Line or grease a cupcake pan, and fill each liner about 3/4 full of batter. Bake in the preheated oven for 17-18 minutes, until the muffins are cooked through and a toothpick inserted in the center comes out clean.