2 tablespoons olive oil 2 pounds chicken breast, boneless and skinless, split in half lengthwise 1 teaspoon of salt, plus more, to taste ¼ teaspoon black pepper, plus more, to taste 4 large yellow onions, sliced ¼ inch thick 4 garlic cloves, finely minced. 1 tablespoon arrowroot starch 1 cup...