Preheat oven to 350 degrees. Lightly grease a 9x9 inch baking dish. In a large bowl combine cooked couscous, tomatoes, beans, Italian seasoning and black pepper; set aside. Cut tops off of peppers remove seeds and membranes. Cook in boiling water for 5 mins. Drain upside down on paper towels Coat a large non-stick skillet with cooking spray. Add beef and shallots; cook over medium heat for 5 mins. or until beef is browned. Drain the fat off of the meat. Add beef mixture to couscous mixture. Stuff the peppers, top with feta cheese. Bake 10 to 15 mins. or until peppers are tender and cheese is melted.