Cut the peppers in half, top to bottom. Remove and discard the seeds/ membranes.
Microwave the peppers for 2-3 minutes, (or until just slightly softened).*
Heat a large skillet to medium-high heat. Add the turkey, onion, & garlic and cook until no pink remains.
Stir in the cauliflower rice and cook for 3 to 4 minutes more.
Add 2 cups of pasta sauce, tomato paste, and Italian seasoning. Simmer uncovered 5 to 7 minutes or until thickened.
Spread the remaining pasta sauce into the the bottom of a 3 quart baking dish. Dab the peppers dry, place them in the sauce, and divide the filling among the peppers.
Cover with aluminum foil and bake for 20 minutes. Remove foil, baste peppers with any sauce in the bottom. Add cheese to the top of each pepper, and bake for 10 to 15 minutes more, until cheese fully melts.
Notes
*Bell peppers can be boiled in a large pot of water for 4 to 5 minutes or until slightly tender. Remove and drain well.Depending on the size of the peppers, you may need more or less filling for each one.