Banana Cinnamon Muffin Recipe

Name: Banana Cinnamon Muffin Recipe
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: American
Ingredients: 10 ounces (or 283 grams) very ripe peeled bananas (see baker's notes); ¼ cup (2 ounces or 57 grams) sour cream, at room temperature; 1 teaspoon pure vanilla extract; 2 cups (9 ounces or 255 grams) all-purpose flour; 1 teaspoon baking soda; ¾ teaspoon baking powder; 1 ½ teaspoons kosher salt; 1 cup tightly packed (7.5 ounces or 213 grams) light OR dark brown sugar; ¾ cup (6 ounces or 170 grams) unsalted butter, at room temperature; 2 large eggs, at room temperature; 9 teaspoons granulated sugar; 1 teaspoon ground cinnamon