Zucchini Beef Bake – from AnnieOops

4 zucchini, cut into 1/4 inch slices
1 cup chopped onion
1 cup chopped celery
olive oil
l lb ground beef
i cup sliced mushrooms
1 6oz tomato paste
1 t salt
1/2 t oregano
1/4 t pepper
2 cups shredded mozzarrella cheese

Heat oven to 350. Arrange zucchini in 13x9 baking dish. In fry pan, cook onion and celery in oil for 5 minutes. Add ground beef, cook until it loses its pink colour.