Preheat your oven to 350°F (175°C).
In a mixing bowl, combine the sour cream, cream of mushroom soup, onion soup mix, minced garlic, and a pinch of salt and pepper. Mix until well blended.
In the baking dish, spread out the uncooked rice evenly. Pour the chicken broth over the rice, ensuring that it is evenly covered.
Place the chicken breasts on top of the rice and broth mixture.
Pour the sour cream and soup mixture over the chicken, spreading it out evenly.
Sprinkle the shredded cheddar cheese on top of the dish.
Cover the baking dish tightly with aluminum foil and bake in the preheated oven for 30 minutes.
After 30 minutes, remove the foil and bake for an additional 15 minutes, or until the chicken is cooked through and the cheese is bubbly.
Remove from the oven and let it sit for about 5 minutes before serving.
Garnish with chopped parsley if desired and serve warm.