In a large bowl, combine the turkey, eggs, and barbecue sauce, and mix well with a wooden spoon or rubber spatula. Stir in the pepper, onion, mushrooms, salt, and pepper and gently mix. Slowly add the bread crumbs and mix just until incorporated. The turkey meatloaf mixture should be moist and thick, not firm and dry. If necessary, add a little more bread crumbs a tablespoon at a time.