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To make the cookies, tip the sugars and butter into a large bowl. Get a grown-up to help you use an electric hand mixer to blend them together until the mixture looks smooth and creamy, and a little paler in colour.
Carefully break in the eggs, one at a time, mixing well between each egg and pausing to scrape down the sides with a spatula. Mix in the vanilla. (To avoid unwanted crunchy bits, get your helper to crack the eggs into a separate bowl first, then it’s easy to pick out any shell before tipping into the mixture.)
Sift in the flour and baking powder, then mix well with a wooden spoon.
Stir through the chocolate chunks. Use your hands to squeeze the dough together in 1 big lump, then split into 2 even pieces. Put each piece on a sheet of cling film.
Roll each piece of dough in the cling film so that they form thick sausage shapes, then seal the ends. Put them in the fridge and chill for at least 3 hrs or overnight – can be frozen at this point.
Heat oven to 180C/160C fan/ gas 4. Take the dough rolls out of the fridge, unwrap and use a small knife to slice each one into 12 pieces, so you have 24 in total.
Place the slices on a baking tray lined with baking parchment. Ask a grown-up to put this in the oven to bake for 20 mins or until the cookies are golden brown on the edges, but still pale in the centre.
Allow to cool slightly before lifting them onto a wire rack to cool completely. Sandwich the cookies together with ice cream and dig in!
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