Preheat oven to 350 degrees F. Lightly coat a 2-quart casserole with cooking spray. In the casserole combine lentil soup, beans, mushrooms, corn, carrot, 1/2 of the cheese, barley, bulgur, onion, thyme, pepper, and salt; stir in the broth.
Cover and bake for 1 hour or until barley and bulgur are tender, stirring twice. Top with remaining cheese. Cover and let stand about 5 minutes or until cheese is melted. If desired, serve with grilled pita wedges.