Good-Cooking - Doughnut Muffins

Ingredients

• 4 1/2 cups all-purpose flour
• 1 tablespoon plus 3/4 teaspoon baking powder
• 1/2 teaspoon each baking soda and salt
• 3/4 cup plain low-fat yogurt
• 3/4 cup 1% low-fat milk
• 1 cup (2 sticks) plus 2 tablespoons unsalted butter, softened
• 1 1/3 cups granulated sugar
• 3 large eggs
• 3/4 stick unsalted butter, melted
• Cinnamon sugar (1 cup sugar mixed with 1 tablespoon ground cinnamon)
• Jelly (optional)
• powdered sugar (optional)