Preheat oven to 350 degrees F. Line or grease a standard 12-count muffin tin.
In a medium bowl, whisk together the flour blend, baking powder, salt and spices. Set aside.
In a large bowl, mash the bananas. Stir in the eggs, 1/3 cup sugar, brown sugar and melted butter. Add the flour and spice mixture to the banana mixture and stir until well combined.
Fill each muffin cup about 2/3 full with the batter. Combine the 1 tablespoon coarse-grain sugar with the 1/4 teaspoon cinnamon in a small bowl. Sprinkle each muffin with a little of the cinnamon sugar topping.
Bake in the preheated oven for 20 to 24 minutes, or until lightly browned and tops spring back when lightly touched.