Hocus Pocus Cake(Makes 8 Servings)  
["13 Oreo chocolate sandwich cookies, finely rolled (about 1 c. crumbs)", "3/4 c. sugar", "1/2 c. all-purpose flour", "1 tsp. baking powder", "1/2 tsp. salt", "3 eggs, separated (at room temperature)", "1/2 c. water", "1 (1 oz.) sq. unsweetened chocolate, melted", "1 tsp. vanilla extract", "3 Tbsp. unsweetened cocoa", "3 c. softened ice cream (any flavor)", "1 c. prepared whipped topping"]
["In small bowl, mix cookie crumbs, sugar, flour, baking powder and salt; set aside.", "In a large bowl, with mixer at high speed, beat egg yolks until thick, about 5 minutes.", "At medium speed, gradually blend in flour mixture alternately with water, melted chocolate and vanilla.", "Fold into batter.", "Spread batter into foil lined and greased 15 1/2 x 10 1/2 x 1-inch baking pan.", "Bake at 375\u00b0 for 10 to 12 minutes, or until toothpick inserted comes out clean."]
["chocolate sandwich cookies", "sugar", "all-purpose", "baking powder", "salt", "eggs", "water", "unsweetened chocolate", "vanilla extract", "unsweetened cocoa", "softened ice cream"]