Good-Cooking - Cinnamon Rhubarb Muffins

Ingredients

• 1 1/2 cups all-purpose flour
• 1/2 cup plus 1 tablespoon granulated sugar, divided
• 2 teaspoons baking powder
• 1 1/4 teaspoons ground cinnamon, divided
• 1/4 teaspoon salt
• 1 egg, beaten
• 2/3 cup buttermilk
• 1/4 cup butter or margarine, melted
• 1/2 cup chopped fresh or frozen rhubarb, thawed and drained
• 1/4 cup peach preserves