Yes, those are waffle fries baked into this frittata—and now we never want to eat a frittata any other way. We tested this recipe with hash browns, too, but waffle fries totally stole the show. Frittatas can sometimes be dry or rubbery, which is why we came up with a foolproof solution: the slow cooker. Cooking the egg mixture low and slow ensures the end result is rich, custardy, and full of flavor. Plus, the oval-shaped slow cooker makes for a fun and unexpected shape, not to mention enough frittata to serve a crowd. For all you ketchup-and-egg lovers out there, we won't tell if you serve ketchup on the side.