Preheat your oven to 350°F (180°C).
Soften the cabbage leaves by boiling, steaming, or microwaving until wilted.
In a large bowl, combine the ground beef, Italian sausage, cooked rice, diced onion, salt, pepper, minced garlic, Italian seasoning, egg, and ½ cup of the tomato sauce. Mix thoroughly.
In a separate bowl, whisk together the remaining tomato sauce, condensed tomato soup, and additional seasoning if desired.
Pour about ½ cup of the sauce mixture into a 9x13 baking dish.
Take a cabbage leaf, place ⅓ cup of filling in the center, fold in the sides, and roll it up tightly. Place each roll seam-side down in the dish.
Pour the remaining sauce over the cabbage rolls. Cover with foil and bake for 1 hour.
Remove the foil, baste the rolls with sauce, and bake for an additional 10 minutes uncovered.
Garnish with chopped parsley and serve warm.