Banana Snickerdoodle Bars

Name: Banana Snickerdoodle Bars
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: American
Ingredients: 1 1/4 cups all-purpose flour; 3/4 teaspoon cream of tartar; 1/2 teaspoon baking soda; ¼ teaspoon salt; 1/4 teaspoon ground cinnamon; 1/8 teaspoon ground nutmeg; 1/2 cup unsalted butter, softened; 1/2 cup white sugar; 1/4 cup firmly packed brown sugar; 1/2 cup mashed ripe banana; 2 teaspoons vanilla extract; 1 tablespoon white sugar; 1/2 teaspoon ground cinnamon