In a medium bowl, whisk together the oatmeal, applesauce, milk, egg, vanilla, butter and brown sugar. In a large bowl, whisk together the flour, baking powder, baking soda, cinnamon, and salt.
Slightly adapted from this recipe.
I switched to brown sugar.
Healthy Applesauce Oatmeal Muffins from Sam's Dish http://samsdish.com/healthy-applesauce-oatmeal-muffins/