Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish.

In a large skillet, add ground beef and chopped onion. Cook over medium heat, breaking up the beef until browned and onion is translucent (about 7-8 minutes). Drain excess fat.

Add shredded cabbage, diced tomatoes, cooked rice, Worcestershire sauce, garlic powder, paprika, salt, and black pepper to the skillet. Stir until well combined.

Let the mixture simmer on low heat for about 5 minutes, stirring occasionally.

Pour the mixture into the greased baking dish, compacting it slightly with a spatula.

Cover with aluminum foil and bake for 30-35 minutes until cabbage is tender.

Remove from the oven and let it rest for 5 minutes before serving.