Elegant French Onion Chicken - Hey Recipe

Ingredients

• 2 tablespoons olive oil
• 2 pounds chicken breast (boneless and skinless, split in half lengthwise)
• 1 teaspoon salt (plus more, to taste)
• 1/4 teaspoon black pepper (plus more, to taste)
• 4 large yellow onions (sliced 1/4-inch-thick)
• 4 cloves garlic (finely minced)
• 1 tablespoon arrowroot starch
• 1 cup low-sodium chicken broth
• 1/2 tablespoon fresh thyme (chopped, plus more, to taste, for garnish)
• 8 ounces Gruyère cheese (shredded)