Heat oven to 200 degrees C. Grease bottoms only of 12 muffin cups or line with patty cups.
In a medium bowl, combine flour, 1/2 cup sugar, baking powder and salt; mix well. In a small bowl, combine milk, oil and egg; blend well. Add dry ingredients all at once; stir just until dry ingredients are moistened (batter will be lumpy.)
Bake for 20 to 25 minutes or until toothpick inserted in centre comes out clean. Cool 1 minute before removing from pan. Brush tops of hot muffins with 2 tablespoons melted butter. Dip in mixture of 1/4 cup sugar and 1/2 teaspoon cinnamon. Serve warm.