Makes one 9×13 dish
FOR THE SAUCE
1 lb. ground italian sausage
4 – 15 oz. cans tomato sauce (or 2 – 28 oz. jars spaghetti sauce)
1 teaspoon onion powder (or 1/2 an onion, chopped fine)
salt and pepper to taste
FOR THE FILLING
1 – 15 oz. container ricotta cheese
8 oz. cottage cheese
3/4 cup of chopped spinach (frozen is fine)
1/2 cup grated parmesan cheese
2 cups mozzarella cheese
Preheat the oven to 350 degrees.
To make the sauce: Brown the meat in a large sauce pan over medium heat, stirring in the onion as the meat cooks. Once the meat is browned, add the tomato sauce and bring to a simmer. Add any seasonings, including salt and pepper, that you desire and allow to simmer over low heat for 10 to 15 minutes.
To make the filling: While the sauce simmers, combine the ricotta, cottage, and parmesan cheeses with the egg in a medium bowl, mixing until well combined.
Next layer on the lasagna sheets, followed by the cheese filling (about half to three quarters of a cup for a 9×13 dish), spinach and more sauce. Finally, sprinkle about a quarter cup of mozzarella on top. Repeat these steps until either you run out of ingredients or the pan is completely full (reserve about a cup of the mozzarella).
Cover the lasagna with aluminum foil and bake for 45 minutes. Remove the aluminum foil and sprinkle the top of the lasagna with the remaining mozzarella. Continue baking, uncovered, for another 15 minutes. Allow to cool on a wire cooling rack for 15 to 20 minutes before serving.