Preheat oven to 350. Prepare cake mix by package directions. Pour batter in well greased and floured bundt or tube pan. In small mixer bowl, beat cream, butter and cornstarch until fluffy. Gradually beat in sweetened condensed milk. Add egg and vanilla and beat till smooth. Pour evenly over cake batter. Bake 50-55 minutes till done. Cool 10 minutes, remove from pan and cool thoroughly. Top with Glaze.
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