I found these on allrecipes (where else?), but found they make great jumbo muffins! They are SO good, one regular sized-muffin just wasn't enough.
1 3/4 cups all-purpose flour
3/4 cup sugar
1 teaspoon baking powder
1 teaspoon baking soda
1/2 teaspoon salt
1/2 cup vegetable oil
1/2 cup plain yogurt (*OR 3/4 cup sour cream)
1 teaspoon vanilla extract
1 cup mashed ripe bananas (*at least one cup)
3/4 cup semisweet chocolate chips
In a large bowl, combine the flour, sugar, baking powder, baking soda and salt. In another bowl, combine the egg, oil, yogurt/sour cream and vanilla. Stir into dry ingredients just until moistened.
Fold in bananas and chocolate chips. (* I lightly floured the chocolate chips to help keep them from sinking during baking)
Fill greased or paper-lined muffin cups two-thirds full.
Bake at 350 degrees F for 22-25 minutes (for regular muffins, 27 minutes for jumbo) or until a toothpick comes out clean. Cool for 5 minutes before removing from pans to wire racks.
SERVINGS: 16 regular or 8 jumbo muffins