Chocolate Sandwich Dessert
["1 (11 oz.) pkg. Oreo cookies", "3 egg yolks, beaten", "3/4 c. sugar", "1 c. milk", "1 envelope gelatin", "1/4 c. cold water", "1 tsp. vanilla", "1 c. whipping cream"]
["Crush the Oreo cookies and put in a buttered 9 x 12-inch pan, reserving 3/4 to 1 cup for top."]
["Oreo cookies", "egg yolks", "sugar", "milk", "gelatin", "cold water", "vanilla", "whipping cream"]