In a large skillet with a tight-fitting lid add sausage, onion and garlic; cook over medium heat for 10 minutes or until sausage is cooked through.
To the same skillet, add next 5 ingredients (salt and pepper through sweet potatoes). Reduce heat, cover and simmer for 10 to 15 minutes or until sweet potatoes are tender.
Uncover skillet; add the chopped spinach then stir and serve.