Preheat the oven to 425°.

In a large bowl, whisk together the flour, sugar, baking powder, and salt.

Add the cheese and stir to mix.

In a medium bowl, mix together the milk, egg, and melted butter.

Make a well in the center of the flour mixture and pour the liquid mixture all at once into the well.

Stir just until moistened.

Do not overmix.

Fill greased muffin cups ⅔ full and bake for 20 to 25 minutes or until done.

Remove the muffins from the pan and cool on a wire rack.