We loved these waffles! I boiled a medium sweet potato and mashed it by itself. It would also have worked quite well if I had used some leftover seasoned mashed sweet potatoes. Even though I have a Cuisinart nonstick Belgian waffle maker, I still coated the waffle iron plates with vegetable oil with a silicone basting brush (and used that brush to sweep off any residue that clung to the waffle iron plates. I would set the waffle iron between 2.5 and 3 for desired brownness. I got 10 individual waffles from this recipe, using about 1/3 cup of batter in each section. I'm so glad I tagged these for Photo Tag!