Preheat oven to 375F. Line a muffin pan with paper liners and set aside.
In a medium bowl, whisk together the eggs, coconut oil, honey, and vanilla. Stir in the mashed bananas.
Add in both flours, baking soda, salt, and cinnamon. Stir to combine.
Divide batter evenly among muffin cups. Bake 18 – 20 minutes, or until a toothpick inserted in centre of muffin comes out clean.
Remove muffins from oven and cool 10 minutes. Remove muffins from pan and cool on a wire rack.
To make the cinnamon sugar topping: Combine the sugar and cinnamon in a small bowl. In another small bowl, melt the butter. Brush each of the muffin tops with the melted butter, then sprinkle the cinnamon-sugar mixture on top. These are delicious when served warm.