Prep. Preheat oven to 400º F. Lightly spray muffin tin with baking spray and set aside.
Whisk dry ingredients. Whisk together the flour, sugar, baking powder, and salt in a large bowl. Add the shredded cheese and gently toss together with the flour mixture.
Mix wet ingredients. Stir together the egg, milk, and melted butter in another small bowl. Pour the egg mixture into the flour mixture and stir until just combined.
Bake and serve. Spoon the cheese muffin mixture into the prepared muffin pan. Bake until golden brown, 20 to 25 minutes. Serve warm.