Stir flour to aerate. Mix the 2 tablespoons sugar with cinnamon. Coarsely chop cranberries with knife. Generously butter a 12 cup muffin pan. In a small saucepan or skillet, melt butter; set aside to cool. In a medium mixing bowl, with a fork, thoroughly stir together the flour, baking powder, salt and sugar. In a small mixing bowl beat egg enough to combine yolk and white; beat in milk and melted butter. Add to flour mixture; stir quickly and lightly just until flour is almost dampened. Add cranberries; lightly stir in; do not beat. Using a large metal spoon, spoon batter into prepared muffin-pan cups, filling each slightly more than half full. Sprinkle 1/2 teaspoon cinnamon-sugar over batter in each cup. Bake in a preheated 375~ oven until golden brown and a cake tester inserted in the center comes out clean - 20 to 25 minutes.
If muffins are to be held 10 to 15 minutes before serving, tip them in the pan to prevent steaming and keep in a warm oven. To reheat cold muffins, place them in a covered pan or a closed paper bag in a preheated 350~ oven for 10 minutes.