Bring a large pot of water to a boil and carefully blanch the cabbage leaves for 2-3 minutes until soft. Drain and set aside.
In a skillet, heat olive oil and sauté onions and garlic until fragrant. Add cauliflower rice and cook for 2-3 minutes.
In a mixing bowl, combine ground beef, parsley, Italian seasoning, salt, nutmeg, whisked egg, and the cooked cauliflower rice mixture.
Place a small portion of the meat mixture into each cabbage leaf, roll tightly, and tuck in the edges.
Spread 1 cup of marinara sauce in a baking dish, then arrange the cabbage rolls on top.
Pour the remaining marinara sauce over the rolls, cover with foil, and bake at 375°F (190°C) for 40 minutes.
Remove the foil and bake for an additional 5 minutes for a slightly crisp top.
Let them rest for a few minutes before serving. Enjoy!