Gluten-Free Banana-Nut Muffins

Ingredients:

• Cooking or pan spray, for greasing
• 1 1/4 cups toasted walnuts
• 1/2 cup amaranth flour (certified gluten-free)
• 1/2 cup brown rice flour (certified gluten-free)
• 1/4 cup tapioca flour (certified gluten-free)
• 1 teaspoon baking powder
• 1/2 teaspoon ground cinnamon
• 1/2 teaspoon fine salt
• 1/4 teaspoon baking soda
• 1/2 cup dark brown sugar
• 1 cup lightly mashed ripe bananas (2 to 3 bananas)
• 1/2 cup milk
• 1/3 cup vegetable oil
• 1/2 teaspoon pure vanilla extract
• 2 large eggs, separated
• Turbinado sugar for sprinkling, optional

Source