Cook and drain vermicelli as directed on package. While vermicelli is cooking, heat oil in 10-inch skillet over medium heat. Cook garlic and onion in oil 2 to 3 minutes, stirring frequently, until onion is crisp-tender. Stir in zucchini, yellow squash and salt. Cook 2 to 3 minutes, stirring frequently, just until squash is tender; remove vegetables from skillet.