Preheat the oven to 375°F and grease a 9x13" pan (or similar sized casserole dish) with olive oil.Put the sweet potato chunks in a microwaveable bowl and add ¼ cup water. Cover the bowl with parchment and microwave for 3-5 minutes, until the sweet potatoes are tender when poked with a fork. Drain any excess water. If you'd rather not use a microwave, you can also just steam the sweet potato on the stovetop.Chop the bacon crosswise into pieces about half an inch wide. Fry the bacon in a large skillet over medium heat until almost crisp. Add the sausage, raise the heat to medium high, and cook until nicely browned. Add the kale and cook, stirring frequently, until wilted. Stir in the cumin, coriander, and cooked sweet potato and remove from the heat.Beat the eggs in a large bowl with the milk or water and nutritional yeast. Add the meat and vegetable mixture to the bowl and stir. Pour everything into the prepared baking dish, using a spoon to spread everything out so it's evenly distributed.Bake for 20 minutes, or until the eggs are just set. Cool for at least 5 minutes before serving. Slice into squares and serve hot.Leftovers can be stored in the refrigerator for up to 3 days. I reheat mine for about a minute in the microwave.