Lemon Yogurt Muffins

I tried these muffins this weekend and they were really good! They're even better after you let them cool and let the sugar on top crystalize a bit.

Lemon Yogurt Muffins

1 3/4 cups all-purpose flour
3/4 cup sugar
1 tablespoon grated lemon peel
1 teaspoon baking powder
3/4 teaspoon baking soda
1/4 teaspoon salt
1 egg
1 cup lemon or plain yogurt
6 tablespoons butter or margarine, melted
1 tablespoon lemon juice
TOPPING:
1/3 cup lemon juice
1/4 cup sugar

In a large bowl, combine the first six ingredients. In another bowl, beat the egg, yogurt, butter and lemon juice. Stir into dry ingredients just until moistened. Fill muffin cups two-thirds full. Bake at 400 degrees F for 20-24 minutes or until a toothpick comes out clean. Cool for 5 minutes; leave muffins in pan. Using a toothpick, poke 6-8 holes in each muffin. In a saucepan, combine the topping ingredients. Cook and stir over low heat until sugar is dissolved. Spoon over warm muffins.