Sweet Potato Waffles with Fluff

Name: Sweet-Potato Waffles with Fluff
Ingredients: 2 pounds sweet potatoes - peeled, coarsely shredded and squeezed dry; 2 large eggs, lightly beaten; 1/4 cup all-purpose flour; 2 tablespoons light brown sugar; 1 1/2 teaspoons ground cinnamon; 1 teaspoon baking powder; 3/4 teaspoon kosher salt; 3 tablespoons melted unsalted butter, plus more for brushing; Marshmallow Fluff, for topping; Chopped toasted pecans, for topping