Preheat the oven to 350°F (175°C) and grease a 9x13-inch baking casserole dish.
Cook the frozen mixed vegetables and frozen broccoli according to package instructions, drain any excess water.
In a large mixing bowl, combine the cooked vegetables, shredded cheddar, cream of mushroom soup, sour cream, salt, pepper, garlic powder, and onion powder. Mix well until everything is evenly coated.
Mix the crushed ritz cracker crumbs with the melted butter in a small bowl until well combined.
Evenly spread the vegetable and cheese mixture into the greased casserole dish.
Sprinkle on the buttered ritz cracker crumbs over the top of the vegetable mixture.
Place the casserole dish in the preheated oven and bake for 25-30 minutes, or until the cheese is melted and bubbly, and the top is golden brown.
Once baked, let it cool slightly before garnishing with chopped fresh parsley. Serve and enjoy!