Preheat oven at 160 C. Grease the bottom of a 20cm round cake tin and line the side of the tin with baking paper.
In a sauce pan, melt the cream cheese and butter into the milk. Cool the cream cheese mixture. When cool, add flour, cornflour, egg yolk and salt and beat until well blended.
In another bowl, beat egg whites together with cream of tartar until foamy, add in sugar and at high speed beat until soft peaks form.
Add egg white mixture to the cream cheese mixture and mix until well blended. Pour into baking pan.