Preheat oven to 350 degrees. Spray a 9×13 pan with non-stick cooking spray.

Brown and drain ground beef, if using. Add spaghetti sauce to skillet with ground beef.

In a small bowl, combine sour cream and cottage cheese.

Layer lasagna in prepared pan starting with sauce/meat mixture, then mozzarella cheese, then uncooked lasagna noodles.

Spread sour cream mixture on top of noodles, and repeat until ingredients are used. End with mozzarella cheese on top.

Pour 1/2 cup water around edges of pan once lasagna is assembled. If your pan is really full, use a baking sheet on the lower shelf of your oven to catch drips.

Cover with foil and bake at 350 degrees for 45 minutes, then remove foil and continue baking for an additional 15 minutes or until top is lightly browned.

Serve with Parmesan cheese, if desired.