Heat oven to 350 degree. Grease muffins tines well. Sift flour, baking powder, sugar and salt into a mixing bowl. Pour the egg, milk and butter into blender and mix until smooth. Add cheese and process only until cheese is finely chopped. Pour into dry ingredients and mix only until flour is moistened. Fill prepared tins 2/3 full. Bake 15 to 25 minutes.