First, you will want to preheat your oven to 375 degrees.
Cook your cauliflower rice. We usually use frozen cauliflower rice in the bag. If you prefer to use fresh cauliflower. Grate or process the uncooked cauliflower in a food processor. Place in a microwave-safe bowl, do not add any water. Cover and microwave for 4 to 5 minutes. Take out and uncover carefully, and set to the side.
In a medium pan, saute your onion in oil, until translucent. Add ground meat and cook it thoroughly, approximately 10 min.
Add bell peppers to the pan, turn heat to medium and cover, stirring occasionally.
After the bell peppers have softened, add your spices, tomatoes, and salt and pepper to taste. Continue to cook a couple of more minutes to blend flavors.
Take your cooled cauliflower rice and squeeze out as much as the excess water as you can.
In a large bowl combine meat and veggie mixture and cauliflower rice and 1 1/2 cups of shredded cheese. Mix thoroughly.
Spoon into a greased 9 x 13 casserole dish, covering with foil.
Cook 25 minutes. Remove from oven, carefully remove foil and add remaining 1/2 cup of shredded cheese.
Place back in the oven and broil 2 to 3 minutes to gently crisp cheese.
Garnish with green chives.