Spiced Apple Cider Muffins

Serves:

• 2 tablespoons packed light brown sugar
• 4 teaspoons whole-wheat flour
• 1/2 teaspoon ground cinnamon
• 1 tablespoon butter, cut into small pieces
• 2 tablespoons finely chopped walnuts (optional)
• 1 cup whole-wheat flour
• 1 cup all-purpose flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 1 tablespoon ground cinnamon
• 1/2 teaspoon ground nutmeg
• 1 large egg
• 1/3 cup packed light brown sugar
• 1/2 cup apple butter, such as Smucker's
• 1/3 cup maple syrup
• 1/3 cup apple cider
• 1/3 cup low-fat plain yogurt
• 1/4 cup canola oil