Drizzle warm muffins with a glaze made by mixing 1/2 cup powdered sugar and 1 to 2 tablespoons of milk or whipping cream until smooth and thin enough to drizzle.
Overmixing can make muffins tough, heavy or rubbery. Muffin batter should not be beaten as much as cake batter. Mix only until the dry ingredients are moistened. It will still be slightly lumpy, which is typical of muffin batter.
Try using 1/2 cup of dried blueberries, cherries or cranberries instead of the fresh