Preheat the oven to 375 degrees and line a 12-cup muffin tin with paper liners.
Next, mash the banana in a large bowl. Then add the rest of the wet ingredients - 1/2 cup of avocado oil, 2/3 cup of maple syrup, 3 room temperature eggs, zest the orange and juice it, and 1 tsp of vanilla. Whisk until well combined.
Mill your flour (use a fine setting) and add with the rest of your dry ingredients - 1 tsp baking powder, 1 tsp baking soda,1/2 tsp cinnamon, and 1/4 tsp salt to a medium bowl.
Pour the dry ingredients that are in a separate bowl into the wet ingredients and mix together with a wooden spoon. Only mix the flour mixture until no flour is visible, do not overmix.
Let the batter sit while you grate your carrots and apple on a box grater. Once shredded, gently fold into the batter.
Use a large ice cream scoop (I've found this works best for muffins) and fill the muffin tin. These will be full to the very top.
Bake for 20-25 minutes until the edges are golden brown and a toothpick inserted into the center of a muffin comes out clean.
Let cool for 10 minutes in the muffin tin and then put on a wire rack to cool completely. Enjoy!