Heat oven to 450. Spray a 8"-square baking pan w/ cooking spray. In lg bowl, beat egg beaters and flour together. Stir in shredded squash, zucchini, 1/4 cup olives and garlic salt. Mix well.
Pour mix into pan. Bake until just set, about 10-12 mins. In small bowl, mix together parmesan cheese and basil. Sprinkle over set mix in pan. Top w/ tomato slices, olives, onion slices, and sprinkle w/ shredded cheese. Bake until cheese is melted, about 5 mins.