Preheat toaster oven to 350°F
Spray 8″x10″x2″ pan with non stick spray.
Peel and cut bananas into pieces and mash bananas until smooth.
Add flour, baking soda, sugar egg, cinnamon, and vanilla extract into bowl and mix until well blended.
Pour batter mix in prepared pan.
Bake for 35 minutes (check at 30 minutes) at 350°F, or until toothpick or knife comes out clean.
Remove from toaster oven.