Sweet Potato & Apple Muffins Recipe from Jessica Seinfeld - Jessica Seinfeld

Ingredients

• 1 medium sweet potato
• Vegetable oil nonstick cooking spray
• 1½ cups gluten-free or all-purpose flour (We used King Arthur’s Measure for Measure)
• 1 teaspoon baking powder
• ¼ teaspoon baking soda
• ½ teaspoon kosher salt
• 1¼ teaspoons ground cinnamon
• ¼ teaspoon grated nutmeg
• 2 large eggs
• ¼ cup (packed) dark brown sugar
• ¼ cup plus 2 teaspoons granulated sugar
• 2 tablespoons maple syrup
• 1 apple
• ½ cup buttermilk
• ½ cup (1 stick) unsalted butter, melted
• 1 teaspoon pure vanilla extract
• 1 cup walnuts, chopped