Preheat your oven to 375°F (190°C).
In a large mixing bowl, combine the rice, cream of mushroom soup, chicken broth, chopped onion, garlic powder, paprika, salt, and black pepper. Stir until well mixed.
Spread the rice mixture evenly in the bottom of a 9x13-inch baking dish.
Place the chicken thighs on top of the rice mixture, skin side up.
Sprinkle the frozen mixed vegetables around the chicken in the baking dish.
Cover the baking dish tightly with aluminum foil.
Bake in the preheated oven for 1 hour.
After 1 hour, remove the foil and bake for an additional 15-20 minutes, or until the chicken is golden brown and cooked through (internal temperature should reach 165°F).
Let the dish rest for 5 minutes before serving. Garnish with fresh parsley if desired.