Preheat oven to 350 degrees. Prepare cake mix as package directs. Pour batter into well greased and floured 10-inch fluted tube pan. In small mixer bowl, beat cheese, margarine and cornstarch until fluffy. Gradually beat in sweetened condensed milk then egg and vanilla until smooth. Pour evenly over cake batter. Bake 50-55 minutes or until wooden pick inserted near center comes out clean. Cool 10 minutes. Remove from pan. Cool thoroughly. Glaze or garnish as desired. FROM "EAGLE BRAND ALL TIME FAVORITE DESSERTS WITH EAGLE BRAND CONDENSED MILK" From a collection of my mothers (Judy Hosey) recipe box which contained lots of her favorite recipes, clippings, etc. Downloaded from Glens MM Recipe Archive, G Internet.