Bring a large pot of water to a boil and add in the lasagna noodles (broken into 2- inch pieces) and cook until al dente (about 10 minutes). Strain and transfer into a large mixing bowl and set aside.
16 ounces lasagna noodles
Meanwhile, preheat the oven to 350°F and begin preparing the meat sauce.
In a large deep skillet, cook the ground beef, sausage, onion, and garlic over medium heat until browned. Drain off any excess fat and return to the pan.
½ pound ground beef, ½ pound Italian sausage, 1 yellow onion, 2 tablespoons minced garlic
Stir in the pasta sauce, Italian seasoning, salt, and pepper, and bring to a simmer for 10 minutes.
24 ounces pasta sauce, 2 teaspoons Italian seasonings, salt, ground black pepper
In a separate bowl, mix together the ricotta cheese, thawed and drained spinach, and some salt and pepper to taste. Set aside
salt, 2 cups ricotta cheese, 8 ounces spinach, ground black pepper
Once the sauce is done, pour it into the bowl with the prepared pasta and mix it together. Then stir in 1 cup of mozzarella cheese and 1 cup of parmesan cheese.
2 cups shredded mozzarella cheese, 2 cups grated Parmesan cheese
Lightly spray a 13x18-inch (half sheet) sheet pan with nonstick cooking spray.
Pour all the lasagna mixture onto the baking sheet and spread it out evenly.
Dollop the ricotta mixture all over the top of the lasagna.
Then top with the remaining grated mozzarella cheese and parmesan cheese.
Bake for 35 to 40 minutes or until the cheese is golden brown and bubbly.
Let the lasagna cool for 10 minutes before serving.