Preheat the oven to 350°F (175°C).

Chop the sweet potatoes, onion, green pepper, and garlic into uniform pieces.

In a sauté pan, heat a drizzle of avocado oil over medium heat and add the vegetables, sauté for 8-9 minutes.

Layer the sautéed vegetables evenly in a greased casserole dish.

In the same pan, cook the turkey sausage over medium heat until fully browned, about 5-7 minutes.

Whisk together the eggs, milk, thyme, salt, pepper, and shredded cheese in a large mixing bowl.

Pour the egg mixture over the layered vegetables and sausage in the casserole dish.

Bake the casserole for 40-45 minutes until the edges are set.

Allow to cool for 5-10 minutes before serving.