In small bowl, combine flour, baking powder, baking soda, and salt and 1/2 teaspoon of cinnamon.
Cream sugar, butter, and vanilla until light and fluffy.
Add eggs and beat well. Stir in banana.
Slowly mix dry ingredients into wet. Chill 30 minutes in refrigerator.
Preheat oven to 400.
Drop teaspoon sized balls of dough two inches apart
