Cook zucchini in pot of salted water (1 teaspoon salt) until barely tender. Drain well.
Saute onion with Italian sausage(take sausage out of casing or buy bulk sausage) and ground beef until meat is no longer pink inside. Add Rice and seasonings. Place 1/2 the zucchini on the bottom of an ungreased 9x13 Pyrex pan. Cover with the meat mixture. Spread the cottage cheese over the top of the meat mixture. Put the remaining zucchini on top of the cottage cheese.
Mix the mushroom soup, sour cream and diced mushrooms together and spread on top of the casserole. Top with Cheese and bake in a 350 degree oven for 45 minutes or until hot and bubbly.