Remove the tops of the bell peppers and clean out the insides.
In a large pan cook the onion, garlic, oil, and spices on medium heat until the onions are translucent.
Add in the ground beef and brown all the way through. Once browned add in the cauliflower rice, tomatoes, and tomato paste. Cook for 3-5 minutes or until everything is cooked through and softened.
Fill the peppers and then top with cheese. Bake for 20-25 minutes and then broil for 2-3, or until the cheese has browned.