Brown ground beef with onion and bell pepper over medium heat in a large skillet. Add minced garlic and all of the seasonings.
Once the meat has cooked add the thawed cauli rice and the diced tomatoes. Stir until everything is mixed together.
Place in a 9X13 pan. Bake for 20 minutes at 350 degrees. Take out of the oven and top with cheese and sprinkle on the green onions and black olives. Bake for another 5 minutes.
Serve warm with a dollop of sour cream.