Sweet Potato Hasbrown Breakfast Casserole

large sweet potato (, or 2 medium (about 24 ounces | 700 grams), peeled and diced into 1/2-inch cubes)

| 500 grams sausages of choice ((beef, chicken or turkey), casings removed*)

red onion (, roughly chopped)

minced garlic

red bell pepper ((capsicum), deseeded and diced)

green bell pepper ((capsicum), deseeded and diced)

sliced mushrooms

baby spinach leaves (, washed)

grape or cherry tomatoes (, halved)

salt and fresh ground black pepper

large eggs

milk

shredded mozzarella cheese ((or cheddar)**)