Preheat broiler, placing rack about 5inches from heat source. Cut zucchini into slices 1/4 inch thick. Salt lightly. Place slices on baking sheet and add in order the pizza sauce, olives, green onions and cheese. Broil until cheese is melted and bubbly, about 4-5 minutes. Zucchini should be tender-crisp. Yield will depend on size of zucchini.