Preheat oven to 375°F. Boil pasta according to package directions.
Saute Italian sausage and onion slices in olive oil until sausage is 3/4 way done, drain. Add tomato sauce and bring to a simmer. Add meatballs and warm through. Cut sausages into two-bite pieces
Cook pasta al dente, firm, but not hard, and transfer to sauce. Toss, adding splashes of pasta water as needed if dry. Transfer to an oiled casserole pan.
Blend 1 part of breadcrumbs to 1 part grated Parmigiano Reggiano, and season with herbs and pepper to taste, then toss as you slowly drizzle-in olive oil, making a slightly moist crumb. Sprinkle crumbs over pasta and place in the top of preheated oven – cooking until it’s browned and bubbling.
All of the family-favorite flavors of spaghetti with a fresh new presentation!