1. For the sauce Heat oil in Dutch oven over medium heat until shimmering. Add onion, 1 teaspoon salt, and 1 teaspoon pepper and cook until softened, about 5 minutes. Stir in garlic and cook until fragrant, about 30 seconds. Add meatloaf mix and cook, breaking up meat with wooden spoon, until no longer pink, about 5 minutes. Stir in cream and simmer until liquid evaporates and only fat remains, about 4 minutes. Stir in tomato puree and tomatoes, bring to simmer, and cook until flavors meld, about 5 minutes. Off heat, stir in basil and season with salt and pepper to taste.
2. For the lasagna Adjust oven rack to middle position and heat oven to 400 degrees. Combine ricotta, 1 cup Parmesan, basil, egg, salt, and pepper in bowl.
3. Spread 1 cup sauce over bottom of 13×9-inch baking dish (avoiding large chunks of meat). Lay 3 noodles in dish, spread 1/3 cup ricotta mixture over each noodle, then top with 1 cup mozzarella and 1 cup sauce (in that order). Repeat layering process 2 more times. Top with remaining 3 noodles, remaining sauce, remaining 1 cup mozzarella, and remaining 1/2 cup Parmesan.
4. Cover dish tightly with greased aluminum foil, place on foil-lined rimmed baking sheet, and bake for 15 minutes. Uncover, and continue to bake until spotty brown and bubbling around edges, 25 to 35 minutes. Let casserole cool for 10 minutes before serving.

To Make Ahead

• Lasagna, prepared through step 3, can be wrapped tightly in plastic wrap, covered with aluminum foil, and refrigerated for up to 24 hours or frozen for up to 1 month; if frozen, thaw completely in refrigerator
• To bake, unwrap lasagna, cover with greased aluminum foil, and bake on foil-lined sheet in 400-degree oven until hot throughout, about 1 hour; remove foil and continue to bake until cheese is golden, about 10 minutes