Good-Cooking - Coffeecake Muffins

Ingredients

• 1 1/2 cups all-purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 4 tablespoons (1/2 stick) butter or margarine
• 1/2 cup granulated sugar
• 1 egg
• 3/4 cup milk
• 1/2 teaspoon vanilla extract
• 1/2 cup packed brown sugar
• 2 tablespoons all-purpose flour
• 1 teaspoon cinnamon