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Place the flour, cocoa powder, baking powder, bicarbonate of soda and sugar in a bowl and mix together, squeeze any lumps out with your fingers.
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In a jug combine the coffee, buttermilk, oil and vanilla. Make a well in the middle of the dry ingredients and pour in, crack in the two eggs as well.
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Beat well with a wooden spoon or electric mixer. Grease and line two 8 inch round cake tins, pour the batter into each equally and bake in an oven preheated to gas mark 4/180c for 40-45 mins until firm and a skewer pushed into the middle comes out clean.
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Remove from the oven and turn onto a cooling rack, allow to go completely cold.
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Once the cake is cold you are ready to frost. Place 8 of the Oreo type biscuits in a food processor and blitz until crumbs.
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Place the lightly salted butter, cream cheese and icing sugar in a bowl and cream together with a fork. Once well mixed stir through the crumbed Oreos.
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Place one cake on a board, spread over the white chocolate spread then spread some of the cookie buttercream over the top of this then press the second sponge on top. Use a spatula to spread the rest of the buttercream evenly round the edge and on the top.
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To finish off cut the rest of the Oreo style biscuits in half and press around the bottom and on the top.

