Preheat oven to 400 degrees. Grease a 9×12 baking dish.
Toss diced sweet potatoes with 1 tablespoon of cooking fat of choice and sprinkle with salt
Place sweet potatoes on baking sheet and bake for 20-25 minutes, until soft.
While sweet potatoes are cooking, place a large sauté pan over medium heat. Add breakfast sausage and cook until no pink remains in meat. Remove and drain on a paper towel.
Wipe out grease from pan and add in remaining tablespoon of cooking fat of choice.
Add onion, red pepper, zucchini and spinach to pan and sauté over medium heat for 3-5 minutes until vegetables are tender.
Place meat mixture in baking dish, add sweet potatoes and sautéed vegetables.
Whisk eggs in a large bowl and season with salt and pepper.
Pour eggs over top of meat and vegetable mixture and mix well.
Place in oven and bake for 25-30 minutes, until eggs are set in the middle.