1. Combine bulgur and water in a small bowl. Let stand until the bulgur is tender and the liquid is absorbed, about 30 minutes.
2. Preheat oven to 350° F. Coat a rack with cooking spray and place it over a baking sheet lined with foil.
3. Combine ground beef, sausage, onion, egg whites, garlic, oregano, salt, pepper, breadcrumbs and the soaked bulgur in a large bowl; mix well. Form the mixture into 1-inch meatballs (about 24). Place the meatballs on the rack and bake for 25 minutes. Blot well with paper towel.