In a large skillet over medium high heat add olive oil, onion, and bell peppers. Cook for 5 minutes until tender. Set aside.
Place ground beef in the skillet and cook for approximately 7-10 minutes until fully cooked.
Drain grease and add ¼ cup of water and homemade taco seasoning. Stir so that meat is fully coated and continue to cook until the liquid has absorbed into the ground beef. Set the meat aside.
In a large bowl combine cooked meat and vegetables, as well as diced tomatoes and chilies, 1 cup of shredded cheese, and cauliflower rice. Stir until thoroughly mixed.
Cut 4 bell peppers in half lengthwise and remove seed and ribs. Please the peppers in a casserole dish and fill with enough water to cover the botter.
Stuff the peppers with meat mixture and top with remaining cheese.
Cover casserole dish and place in oven to bake for 20-30 minutes, or until bell peppers are tender.