Got this from a magazine many moons ago...
Melt butter with cocoa.
Remove from heat, add sugar, whisk in eggs.
Stir in sifted flour, beat until smooth.
Pour mixture into greased 16cm x 26cm tin.
Beat cheese, extra sugar and vanilla together, add extra egg, pour over chocolate mixture, swirl through with knife to give a'marbled' effect.
Bake in moderate oven for 40 minutes.
Cool in tin, cut when cold.
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