You can use sweet potatoes, but instead of onion, you can use Allspice. If you do not have parsley or rosemary, you can use other herbs, like thyme, or oregano. Onion powder gives you an amazing aroma, but if you don't have it in a powder form, shred or dice onion really into almost minced form. You may use green onions as well. Some waffles are smaller, so just use fewer potatoes or if you want them thinner. Make sure to grease the waffle iron really well. This way it will cook much better. This is not your typical waffle and it might stick, so heat the waffle maker, then grease it before placing the potato mixture. What OIL: You can use any oil on hand. I used OLIVE oil, but you can use any on hand. I used just a pinch of Sriracha salt over all the waffles when I finished.