Preheat oven to 375°F; spray a large aluminum roasting pan, approximately 12x18 inches, with cooking spray.
Cook beef, sausage, and onions in a large pot or Dutch oven over medium-high heat about 12-15 minutes, until meat browns and onions soften. Drain excess fat.
Add garlic; cook 1 minute, until fragrant.
Stir in both jars marinara, crushed tomatoes, Italian seasoning, basil, salt, and pepper. Simmer 10 minutes; add 1 cup water to thin slightly for no-boil noodles.
Mix ricotta, eggs, 1/2 cup Parmesan, and parsley well in a large bowl.
Spread 2 cups meat sauce evenly over prepared pan's bottom.
Layer 8 noodles, breaking to fit.
Spread with half the ricotta mixture; sprinkle with 2 cups mozzarella.
Top with one-third of remaining meat sauce; repeat layers once.
Finish with remaining 8 noodles, meat sauce, mozzarella, and Parmesan.
Cover tightly with foil; bake 60 minutes.
Uncover; bake another 15 minutes, until cheese is golden and bubbly.
Rest 20 minutes to set layers before cutting.