Banana Muffins I

Details

Ingredients

• 1 cup all-purpose flour
• 1 tablespoon baking powder
• ½ teaspoon baking soda
• ¼ teaspoon salt
• 1 cup mashed ripe banana
• ¼ cup white sugar
• ¼ cup sour cream
• 1 egg
• ½ teaspoon vanilla extract