In a skillet over medium heat, cook the ground beef until browned. Drain excess fat.
Add the cauliflower rice, tomato sauce, garlic powder, onion powder, salt, and black pepper to the skillet. Stir to combine and cook for another 5 minutes.
Stuff each bell pepper with the beef mixture and place them in a baking dish.
Top each stuffed pepper with shredded cheese.
Bake in the preheated oven for 20-25 minutes, until the peppers are tender and the cheese is melted and bubbly.