Preheat Oven: Preheat oven to 350°F (175°C). Grease a 9×13 inch baking dish.
Cook Ground Beef: Brown ground beef, onion, and garlic in a large skillet. Season with salt, pepper, and paprika. Drain excess grease.
Combine Ingredients: In a large bowl, combine cream of mushroom soup, sour cream, milk, cooked ground beef, cooked rice, and 1 cup of shredded cheese. Stir in frozen peas, if desired.
Assemble Casserole: Pour the mixture into the prepared baking dish. Top with remaining 1 cup of shredded cheese.
Bake: Bake in preheated oven for 25-30 minutes, or until bubbly and golden brown.
Serve: Let cool slightly before serving. Garnish with fresh parsley, if desired.
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