Brown ground beef and set aside. In small bowl, mix bisquick, eggs and milk on medium speed until smooth. In medium-large casserole dish, layer in upside down manner: ground beef first, onion, garlic salt, salt and pepper, then cheese, then sauce and last the bisquick mixture. Sprinkle with parmesan cheese. Cook in oven for 20 minutes about 350 degrees or 400 degrees according to oven. Serves 6 to 8.