Preheat the oven to 350°F (175°C) and spray a 12×17 sheet pan with non-stick cooking spray.
Bring a large pot of salted water to a boil. Add the broken lasagna noodles and cook until al dente according to package directions, about the time recommended. Drain and set aside.
In a medium skillet over medium heat, add the spinach and sauté 2–3 minutes until wilted; remove from heat and let cool slightly.
In a bowl, combine the ricotta cheese with the cooked spinach and season with salt and pepper; set aside.
Heat 1 tablespoon olive oil in a large skillet over medium-high heat. Add the ground beef and Italian sausage and cook, breaking up meat, until no longer pink.
Add the diced shallot and minced garlic to the cooked meat and sauté about 3 minutes until softened. Drain any excess grease from the skillet.
Stir in the marinara sauce, Italian seasoning, and salt and pepper to taste. Simmer a few minutes to combine.
Toss the cooked noodles with the meat sauce in the skillet or a large bowl until well coated. Stir in 1 cup of the shredded mozzarella.
Spread the noodle and meat mixture evenly on the prepared sheet pan.
Drop spoonfuls of the ricotta and spinach mixture over the noodles and gently spread or leave dollops as desired.
Sprinkle the remaining 1 cup shredded mozzarella and the grated Parmesan over the top.
Bake uncovered for 35 minutes, until the cheese is melted, browned, and bubbly. Let cool a few minutes, then garnish with chopped fresh basil before serving.