PREPARATION:

1. Preheat oven to 450°F. Remove and discard stems from spinach. Rinse leaves and drain well; set aside. Thinly slice apple; cut slices into 1/2-inch pieces. Place in small bowl with lemon juice and 1 tablespoon water; stir to completely coat apple pieces with juice. Drain; set aside.
2. Spray large skillet with cooking spray. Heat over medium-high heat until hot. Add walnuts; cook and stir 5 to 6 minutes or until nuts are light golden. Stir in apple, garlic and raisins. Add spinach and drizzle with olive oil. Cover and cook 1 minute or until spinach begins to wilt. Stir until spinach is just wilted and coated with oil.
3. Place bread shells on baking sheet. Divide spinach mixture evenly among shells, leaving 1/2-inch border. Crumble cheese over spinach. Season with black pepper. Bake 6 minutes or until cheese is melted and shells are warm. Cut each shell into 4 wedges.