Hmm... I can't remember what recipe I used to make these, because I'm fairly certain I just sorta winged it.
Cook up about a half a pound of ground turkey with a can of diced tomatoes and a small amount of quick rice (maybe like 1/2 cup cooked?)... Add pepper, garlic and parsley to taste, spoon into your gutted peppers. Add some breadcrumbs and parmesan on top! Bake at 350 for 30 minutes or until tender. I think I was surprised that they ended up taking longer, but they tasted pretty good.