In a saute pan over medium-high heat, cook and crumble sausage until no longer pink. Remove from heat.
In a mixing bowl, combine ricotta, beaten eggs, one cup parmesan cheese, spinach and ¾ cup parsley. Add about ⅔ of cooked sausage and fold in.
Add ingredients for red sauce and remaining sausage (with any grease) to extra large oven safe saute pan (needs to have a lid). Stir to combine. NOTE - you can also use 2 13x9 baking dishes and cover with foil.
Preheat oven to 350degF.
Start filling uncooked shells with ricotta mixture. Use a metal table spoon to push mix into tightly rolled shells. Line with out in concentric circles in the pan.
Cover pan with lid and place in oven for 45 minutes to bake.
Remove pan from oven and remove lid from pan. Sprinkle with mozzarella, remaining parmesan and remaining parsley. Return to oven to bake for 10 minutes more.
Remove from oven and let rest at least 5 minutes before spooning out to serve.
Keyword baked pasta, Garlic, grated parmesan, Italian Sausage, jumbo shells, mozzarella, onions, red sauce, ricotta, ricotta cheese, spinach, stuffed shells