Chocolate Praline Torte
["1 1/2 c. chopped walnuts", "1 1/2 c. vanilla wafer crumbs", "1 c. firmly packed brown sugar", "1 c. margarine, melted", "1 (18.5 oz.) pkg. devil's food cake mix (without pudding)", "1 1/2 c. whipping cream", "3 Tbsp. powdered sugar", "1 tsp. vanilla"]
["Combine first 4 ingredients.", "Sprinkle about 3/4 cup of walnut mixture in each of 4 ungreased 9-inch round cake pans, pressing lightly into pans.", "Prepare cake mix according to package directions; pour batter over walnut mixture in prepared pans. Bake at 350\u00b0 for 15 to 20 minutes or until a wooden pick inserted in center comes out clean.", "Remove layers from pans immediately and let cool completely."]
["walnuts", "vanilla wafer crumbs", "brown sugar", "margarine", "cake mix", "whipping cream", "powdered sugar", "vanilla"]