-
1
Preheat oven to 375 degrees F (190 degrees C). Spray a 9x13-inch baking dish with cooking spray.
-
2
Heat spaghetti sauce in a saucepan over medium heat.
-
3
Cook and stir sausage and water in a large skillet over medium heat, using a potato masher to break sausage into small pieces, until sausage is crumbly and almost cooked through, about 5 minutes. Add pepper and onion; cook and stir until onion is tender, 5 to 10 minutes.
-
4
Stir cottage cheese, eggs, Parmesan cheese, and parsley together in a bowl.
-
5
Spread about 1 cup warmed spaghetti sauce into the bottom of the prepared baking dish. Arrange 3 lasagna noodles over the sauce. Spread 1/2 of the cottage cheese mixture over the noodles, another 1 cup spaghetti sauce over the cheese, and 2/3 cup sausage mixture over the top. Sprinkle 1/2 of the pepperoni pieces, 1/2 of the sliced mushrooms, and 1/2 of the olives over the sausage mixture. Scatter 1/3 the mozzarella cheese over the top and arrange 3 lasagna noodles atop the cheese. Repeat layering again.
-
6
Pour remaining spaghetti sauce over the lasagna and sprinkle remaining mozzarella cheese over the top. Cover baking dish with aluminum foil.
-
7
Bake in the preheated oven until sauce is bubbling around the edges, about 25 minutes. Remove aluminum foil and continue baking until cheese is melted and golden, about 5 minutes more. Cool for 15 minutes before slicing.
