Preheat oven to 350 degrees F. Spray large rimmed baking pan with cooking spray. Place sweet potato on half of pan and season with 1/2 teaspoon salt and 1/4 teaspoon black pepper. Place sausage links on other half of pan.

Transfer to oven and bake 10 minutes. Transfer sausage to cutting board. Stir sweet potatoes and return to oven. Continue baking sweet potatoes 8 to 10 minutes longer or until tender. Remove sweet potatoes from oven; leave oven on.

Slice sausage into 1/2-inch pieces. Spray 9 x 13-inch casserole dish with cooking spray. Evenly spread sliced sausage and sweet potatoes over bottom of pan. Spread green onions, spinach and roasted red pepper over sweet potato mixture.

In large liquid measuring cup, whisk eggs until smooth. Add milk and remaining 1/2 teaspoon salt and 1/4 teaspoon black pepper; whisk until well combined. Pour egg mixture over sweet potato mixture in casserole dish.

Dollop goat cheese in large pieces over egg mixture. Transfer casserole to oven and bake 35 to 40 minutes or until eggs are set. Let cool 5 minutes before slicing into 8 pieces and serving.