Good-Cooking - Apple Cinnamon Yogurt Muffins

Ingredients

• 3 cups all-purpose flour
• 1 3/4 cups granulated sugar
• 3 1/2 teaspoons baking powder
• 1/2 teaspoons salt
• 1/2 teaspoon grated orange zest
• 1/4 teaspoon ground nutmeg
• 1 cup (2 sticks) butter or margarine
• 1 cup grated Braeburn or Golden Delicious apple
• 1 container (8-ounce) low fat vanilla yogurt
• 2 large eggs, beaten
• 1 teaspoon ground cinnamon