Banana muffins

This isn't a dinner recipe, but a really simple, tasty muffin recipe I came across today. Very approachable for kid chefs...

INGREDIENTS (Nutrition)
1 1/2 cups all-purpose flour
1 teaspoon baking powder
1 teaspoon baking soda
1/2 teaspoon salt
3 large bananas, mashed
3/4 cup white sugar
1 egg
1/3 cup butter, melted
1/2 tsp vanilla (optional)

DIRECTIONS

1. Preheat oven to 350 degrees F (175 degrees C). Coat muffin pans with non-stick spray, or use paper liners. Sift together the flour, baking powder, baking soda, and salt; set aside.
2. Combine bananas, sugar, egg, melted butter and vanilla (optional) in a large bowl. Fold in flour mixture, and mix until smooth. The key is to hand-mix in the flour mixture just until moiste.
3. Scoop into muffin pans.
4. Bake in preheated oven. Bake mini muffins for 10 to 15 minutes, and large muffins for 25 to 30 minutes. Muffins will spring back when lightly tapped.