Marbled chocolate cheesecake slice - gluten free

This is one of my quick stand-by recipes.  It's a very yummy slice that goes together very fast, but looks like you've gone to lots of effort.  If you don't need gluten free, just use regular wheat flour. 

MARBLED CHOCOLATE SLICE

·        185g butter
·        ¼ cup cocoa
·        1 cup sugar
·        2 eggs, lightly whisked
·        1 cup plain flour [gluten free]
·        250g cream cheese
·        1/3 cup sugar, extra
·        1tsp vanilla
·        1 egg, extra

Preheat oven to 180^oC. Grease and line a lamington pan (16cm x 26cm) with baking paper.

Melt butter with cocoa. Remove from heat, add sugar and whisk in eggs. Stir in sifted flour and beat until smooth. Pour mixture into the prepared pan.

Beat cheese, extra sugar and vanilla together, add the extra egg. Pour over the chocolate mixture; swirl through with a knife for a marbled effect.