Banana Chocolate Chip Muffins

Bahan-bahan (12 porsi)

• 1 cup overripe bananas, (mashed (about 3 large bananas))
• 1 large egg, (room temperature)
• ¼ cup sour cream
• 1 ½ teaspoons vanilla extract
• ¼ cup unsalted butter, (melted)
• 2 tablespoons vegetable oil
• ¼ cup brown sugar, (packed)
• ½ cup granulated sugar
• 1 ⅔ cup all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• ½ teaspoon salt
• 1 cup milk chocolate chips