Place the chicken in the bottom of the crockpot and season with salt and pepper. Add the broth, onion, carrots, celery, garlic, thyme, oregano, and bay leaf.
1½ pounds boneless, skinless chicken breasts, ½ teaspoon kosher salt, ¼ teaspoon ground black pepper, 8 cups low sodium chicken broth, 1 onion, 3 carrots, 2 ribs celery, 4 cloves garlic, ½ teaspoon dried thyme, ½ teaspoon dried oregano, 1 bay leaf