Cook zucchini and squash in hot oil on medium heat about 4 minutes in large skillet. (If using small skillet, you may have to cook a little longer)
Add garlic to pan. Cook about another 3-4 minutes or until tender or slightly browning.
Remove from heat. Drain any excess oils. Place back in pan and add the basil. Stir until evenly coated. Place in serving dish. Sprinkle with Parmesan cheese to your liking and top with mozzarella cheese.