Preheat oven to 350 degrees Fahrenheit (175 degrees Celsius).

Grease a 12-cup muffin pan with cooking spray or liquid vegetable oil.

In a mixing bowl, combine flour, sugar, baking powder, nutmeg, and salt.

Create a well in the center of the dry ingredients.

In a separate bowl, lightly beat the egg; stir in milk and melted butter or margarine.

Add the egg mixture to the flour mixture.

Stir just until moistened; the batter may be lumpy.

Fill the prepared muffin cups about halfway full with batter.

Bake in the preheated oven for 20 to 25 minutes, or until the muffins are golden brown.

While muffins bake, melt butter for the topping.

In a shallow bowl, combine sugar and cinnamon for the topping.

Once muffins are out of the oven, immediately dip the tops of the hot muffins into the melted butter, then into the cinnamon-sugar mixture until coated.

Serve warm.

Store muffins at room temperature, covered.