Cut and reserve tops off peppers; remove seeds. If necessary, cut thin slices from pepper bottoms to level.; set aside peppers.
In a large skillet, cook the turkey, mushrooms, onion, and garlic over medium heat until meat is no longer pink. Remove from heat; let stand for 5 minutes.
Stir in 1/4 cup tomato sauce, rice, cheeses, and seasonings; spoon into peppers. Place upright in a greased 11-in x 7-in baking dish. Spoon remaining tomato sauce over peppers; replace pepper tops. Cover and bake at 400 degrees for 18-22 minutes or until heated through and peppers are crisp-tender.
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