Toasted Israeli Couscous With Corn and Herbs

Ingredients 1 cup Israeli couscous 1 tablespoon olive oil 1 1/2 cups water or vegetable broth 1 cup fresh or frozen corn kernels 1/2 cup cherry tomatoes, halved 1/4 cup finely chopped red onion 1/4 cup chopped fresh parsley 2 tablespoons chopped fresh mint 2 tablespoons chopped fresh basil 1/4 cup crumbled feta cheese (optional)