1. Preheat the oven to 425 F and line a 12-count muffin tin with parchment or muffin liners. In a large mixing bowl, whisk together the flour, baking soda, baking powder, salt and cinnamon. Set aside.
2. In another mixing bowl, whisk together the 2 eggs with the melted coconut oil for 15 seconds. Add the coconut sugar and maple syrup and whisk again to combine. Add the bananas and stir until completely combined, getting rid of as many lumps as possible before adding in the vanilla extract and stir. Combine the wet ingredients with the dry, and stir just until combined. Gently stir in the shredded carrots and walnuts.
3. Divide the muffin batter evenly among the muffin liners. Add a sprinkle of oats on top of each muffin, if using. Place the muffins in the oven and bake for 5 minutes, before reducing the oven temperature to 350 F and baking for an additional 9-10 minutes, or until a toothpick inserted in the center comes out clean.
4. Remove the muffins to a wire rack and cool completely. Enjoy immediately!

Leftover muffins can be stored at room temperature for 3-4 days in an airtight container, or in the freezer for up to 2 months.