Preheat the oven to 350F and grease an 8X8 baking dish.
Add the cooked rice, shredded cheese, sour cream, and seasonings to a large mixing bowl and mix well.
Add the frozen mixed vegetables and fold them in gently.
Spread the rice into the prepared baking dish, smoothing it out until it is even.
Cover with aluminum foil and bake for 20 minutes or until the cheesy is melted and bubbly.
Serve and enjoy!