Heat oven to 350. Generously grease a casserole dish with non-stick spray.

Heat spaghetti sauce & cooked hamburger meat in a saucepan on medium heat until thoroughly warmed. Cook egg noodles according to package directions, drain and pour into a large bowl.

While the noodles are still warm, stir in cottage cheese and sour cream. Blend well.

Pour half of the hot noodle mixture into the bottom of the greased casserole dish. Layer meat mixture on top of noodles. Scatter one cup of cheese on top of the meat sauce, and repeat this layer sequence.

Bake for 20 minutes or until hot and bubbly.