Prepare the bell peppers: Slice the tops off the peppers and remove the seeds and membranes. Place them upright in a baking dish.
In a large skillet over medium heat, add a splash of olive oil. Sauté the chopped onion for about 3-4 minutes until it becomes translucent.
Add the minced garlic to the skillet, stirring for an additional minute until fragrant.
Add the ground turkey or chicken to the skillet. Cook until browned, breaking it up with a spatula, about 5-7 minutes.
Stir in the cauliflower rice, diced tomatoes, ground cumin, smoked paprika, salt, and pepper. Mix well and cook for another 3-4 minutes until heated through.
Remove the skillet from heat and stir in half of the shredded cheese until melted and combined.
Stuff the bell peppers with the meat and cauliflower mixture, pressing down gently to pack it in.
Top each stuffed pepper with the remaining shredded cheese.
Cover the baking dish with foil and bake for 25 minutes. Then remove the foil and bake for an additional 10 minutes until the peppers are tender and the cheese is bubbly and golden.
Remove from the oven and let cool slightly. Garnish with fresh cilantro or parsley before serving.
Notes
Feel free to customize the filling with your favorite vegetables.