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1
Place the flour , sugar , cocoa powder and 145grams of the butter together into a bowl or food processor and combine until mixture resembles fine bread crumbs .
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2
Make a well in the middle of the dry ingredients and add the whisked egg and the milk and combine until dough comes together , then turn onto a lightly floured surface and knead dough until smooth .
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3
Now divide the dough in half , shape halves into 2 discs , wrap in plastic wrap and refrigerate for 30 minutes , till chilled and firm .
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4
Now preheat your oven to 180C / 360F .
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5
Then line two baking trays with baking paper and set aside till needed .
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6
Take the chilled dough discs and roll one disc between two sheets me baking paper until about 5mm thick , now using a 4cm - square cookie cutter , cut out squares from the dough (note if dough becomes too soft , refrigerate until firm) , repeat with second dough disc to make a total of 50 dough squares .
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7
Place prepared dough squares onto prepared baking trays , 2cm apart , and refrigerate for 10 minutes or until dough squares are firm .
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8
Once chilled , place baking trays of biscuits into the oven and bake , 1 tray at a time , for 8-10 minutes .
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9
Once cooked remove from heat and stand on trays for 5 minutes then transfer to a wire rack to cool completely .
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10
TO MAKE CHOCOLATE CREAM : place 50 grams of the dark chocolate into a heat proof bowl and microwave on high for 45 second bursts , stirring and each burst , until melted and smooth , cool for 5 minutes .
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11
In a separate bowl add the butter and icing sugar and beat till light and fluffy , then add the vanilla and the melted chocolate and stir to just combined (don't overbeat) .
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12
Spread about 1 teaspoon of the cream filling mixture onto one of the little prepared square biscuits and top with another biscuit so to sandwich together .
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13
Repeat with all and refrigerate for about 20 minutes to chill through .
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14
Place the broken up milk chocolate and the remaining broken up dark chocolate into a heatproof bowl and microwave on high 45 second bursts , stirring at each burst) until melted and smooth .
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15
Set a wire cooling rack over some baking paper , now dip each side of the square filled sandwiches into the chocolate to cover all the sides , place on rack to set , repeat with all .
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16
Now place a spoonful of the melted chocolate into the tops of each side chocolate coated biscuit sandwich and leave on wire rack to set completely .
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17
Once set turn chocolate coated biscuits over and repeat with chocolate to cover the bottoms , leave to set completely .
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18
Refrigerate for best results .
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19
Once set , place on plate , serve and enjoy .
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20
:-) .
