Add sugar, butter to a mixing bowl and mix well to combine. Add yogurt, applesauce, eggs, vanilla, pumpkin, carrots and banana and stir well.

In a separate mixing bowl stir together flour, oats, salt, baking soda and cinnamon. Add to the wet mixture and stir, just until combined. Divide batter among greased or lined muffin cups (should make about 18 muffins).

Bake at 375 degrees F for 15-18 minutes or until a toothpick inserted in the center comes out clean.