Preheat your oven to 350°F (175°C).

Chop the sweet potatoes into ½-inch cubes, and dice the onion and green pepper.

Grease your casserole dish with a little butter or cooking spray.

Sauté onions, green pepper, and sweet potatoes in avocado oil for about 8-9 minutes. Add minced garlic in the final minute.

Spread sautéed vegetables evenly across the bottom of the greased casserole dish.

Cook the turkey sausage until browned, then combine with the sautéed vegetables.

Whisk together the eggs, milk, fresh thyme, salt, pepper, and shredded cheese until smooth.

Pour the egg mixture over the sausage and vegetable mixture, stirring gently to combine.

Bake in the preheated oven for 40-45 minutes until puffed and lightly golden.

Let the casserole cool for 15 minutes before serving.