Preheat oven to 400 degrees F.
Oil a 9x12” baking dish.
Coat sweet potatoes in oil and put them on a baking sheet. Bake for 25 minutes until soft.
While sweet potatoes are baking, prepare the remaining ingredients.
In a large sauté pan, heat the oil over medium heat. Add the onions and peppers. Cook for 5 minutes.
Add the sausage to the pan, using a fork to crumble it as it cooks.
Once the sausage is fully cooked, mix in the greens and cook another 2 minutes.
Whisk the 12 eggs together in a bowl. Mix in the salt and garlic powder.
Spread the sweet potatoes evenly along the bottom of the baking dish.
Layer the meat mixture evenly on top of the sweet potatoes.
Gently pour the egg mixture evenly over the casserole.
Bake the casserole for 25-30 minutes.
Serve warm.