Good-Cooking - Raspberry Filled Cinnamon Muffins

Ingredients

• 1 1/2 cups flour
• 2 1/2 teaspoons baking powder
• 1/4 teaspoon salt
• 1/2 cup granulated sugar
• 1 teaspoon cinnamon
• 1 egg, slightly beaten
• 2/3 cup low-fat buttermilk
• 1/4 cup butter, melted
• 1/4 cup seedless raspberry preserves
• 1 tablespoon granulated sugar
• 1/4 teaspoon cinnamon