Meatlovers! Cook protein between Steps 2 and 3, placing pan used to cook pasta over medium heat. If using vegetarian sausage, crumble into bite-sized pieces. Stir often with 1 tsp. olive oil, breaking up with a spoon, until warmed through, 6-8 minutes. Vegetarian sausage will not brown. If using Italian sausage remove from casing. Stir often, with 1 tsp. olive oil breaking up meat, until no pink remains and sausage reaches a minimum internal temperature of 160 degrees, 4-6 minutes. If using ground beef, stir often until no pink remains, and ground beef reaches a minimum internal temperature of 160 degrees, 4-6 minutes. Add protein to sauce with butternut squash.