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Step 1: Preheat oven to 180°C / 160°C fan. Line an 8x8-inch tray.
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Step 2: Cream butter, sugar, and vanilla together.
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Step 3: Mix in flour and cornflour to make a crumbly dough.
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Step 4: Stir in the chocolate.
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Step 5: Press dough into the tray and score where you’ll cut later.
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Step 6: Sprinkle with sugar and bake for about 45 mins.
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Step 7: Rescore while warm, cool in the tray, then cut into bars.