Preheat the oven to 375 degrees Fahrenheit and spray a 9x13-inch baking dish with non-stick cooking spray.
Add the 2 ½ cups chicken broth, 1 cup white rice, 3 tablespoons lemon juice, 3 tablespoons melted butter, 1 tablespoon lemon zest, 1 tablespoon minced garlic, 1 teaspoon onion powder, 1 teaspoon salt, 1 teaspoon dried basil, ½ teaspoon pepper, and ½ teaspoon thyme to the prepared baking dish and mix.
Season the 1 pound cubed boneless skinless chicken breast with 1 teaspoon salt and 2 teaspoons lemon pepper, and place it in the baking dish with the other ingredients.
Bake for 30 minutes, then place the thin slices from 1 lemon over the top of the dish, and bake for another 5 minutes until the rice is tender and the chicken is cooked through.
Remove from the oven and let the dish rest for 5 minutes before serving.