Hello. Yes, you can cook frozen chicken breasts straight from the bag without thawing them first, but you need to adjust your cooking method so they do not dry out or stay raw in the middle.
One of the easiest ways on a busy weeknight is baking them in the oven. Preheat your oven to 425 degrees Fahrenheit. Place the frozen chicken breasts in a single layer in a baking dish, add a splash of chicken broth or olive oil to keep them moist, and season them with your favorite spices. Cover the dish tightly with foil and bake for about 30 to 45 minutes, then remove the foil for the last 10 minutes to let them brown slightly. Always check with a meat thermometer to ensure the internal temperature reaches 165 degrees Fahrenheit.