Preheat oven to 350°F. Core and separate cabbage leaves, blanch in boiling water until soft, and set aside.

In a large skillet over medium heat, cook ground beef and chopped onion until browned. Drain excess fat.

Add uncooked rice, chili powder, garlic powder, salt, and pepper to the meat mixture. Stir in crushed tomatoes and combine well.

Spread half of the cabbage leaves in a baking dish. Spoon meat mixture over the leaves, then cover with remaining cabbage leaves.

Mix tomato sauce, brown sugar, and vinegar. Pour over assembled cabbage rolls. Cover with foil.

Bake in the preheated oven for 90 minutes. Remove foil and bake for an additional 10 minutes if desired.

Let rest for 5 minutes before serving. Enjoy your hearty cabbage rolls!