Keep the screen awake with cook mode on the Good Food app.
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Method
step 1
Preheat oven to 180C/fan 160C/gas 4.
step 2
Mix the butter and sugar in a large bowl with a wooden spoon to make a soft and creamy mixture, then add the egg yolk and vanilla extract and briefly beat to combine.
step 3
Sift over the flour and cocoa add the chocolate chunks, then MIX WELL!
step 4
Scoop the mixture into 12 large balls onto a non-stick baking sheet. Space well apart, as they will spreadwhile cooking. Flatten slightly, bake for 12-15 mins
step 5
Transfer the cookies to a cooling rack to firm up.