1. Preheat the oven to 350°F.
2. Puree the bananas, spinach, and strawberries in a blender.
3. In a medium-size bowl, combine the flour, sugar, egg, oil, baking soda, cinnamon, and salt.
4. Pour the smoothie mixture into the bowl and mix well.
5. Put paper or silicone muffin cups in a muffin pan (you'll need two pans for 14 muffins).
6. Spoon in the batter, filling each cup about three quarters full.
7. Bake for 20 to 30 minutes or until a toothpick inserted comes out clean.
8. Allow the muffins to cool on a rack, and enjoy!

Makes 14 muffins. Here's the nutritional information for one muffin.

Source: Calorie Count [1]