Preheat oven to 350 degrees. Line muffin pan with liners. Mix flour, baking powder, salt, and nutmeg into a bowl. Make a well in the center of the bowl. In a different bowl, mix wet ingredients, oil, sugar, egg, milk. Mix well.
Pour wet ingredients into the well and combine with the dry ingredients.
Fill muffins and bake for 20 - 25 minutes. Let muffins cool. Combine cinnamon and sugar together in a small bowl. Melt butter and place in separate bowl. Dip each muffin in the melted butter, then dip in cinnamon sugar.