Sourdough Banana Muffins
Ingredients:
* 1 1/4 cups (150 g) all-purpose flour
* 1 teaspoon baking powder
* 1 teaspoon baking soda
* 1/2 teaspoon salt
* 1 ½ teaspoons ground cinnamon
* 3 large ripe bananas about 1 and 1/2 cups mashed
* 6…