Preheat oven to 375 degrees. Spray the bottoms of a 12 regular -size muffin tin with cooking spray.
In a medium bowl, combine the sugar, oil and eggs with a whisk. Add in the bananas and vanilla and whisk until combined.
Mix in the flour, baking soda, salt and cinnamon. Stir until all is combined.
Divide batter evenly amount the muffin cups. The cubs will be about 3/4 filled.
Baked 15-20 minutes or until a toothpick inserted in center comes out clean and the muffins are rounded on top.
Remove muffins from pan and allow to cool on a rack.
Combine the cinnamon and sugar topping in a bowl. Dip the muffin tops into the mixture. Serve slightly warm!