"The Chocolate Chip Cookies of my dreams, based on the famous Butter Boy cookies. Super crispy outsides, soft baked inside, exceptional chew...."
INGREDIENTS
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225g / 2 US sticks unsalted butter (, cut into 1cm / 1/2" cubes)
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2 cups (300g) plain flour / all-purpose flour (, spooned and levelled (IMPORTANT - Note 1))
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3 tsp cornflour/cornstarch (, tightly pack and level the spoon measure)
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1/4 tsp baking powder
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1/2 tsp baking soda / bi-carb (, sifted if lumpy (don't sub more baking powder, Note 2))
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1/2 tsp cooking salt / kosher salt ((halve for table salt, +50% for flakes))
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1 tightly packed cup (200g) brown sugar ((light brown sugar))
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1/2 cup (100g) caster sugar / superfine super ((sub regular/granulated))
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1 large egg ((55g / 2 oz in shell), at room temp)
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1 yolk from a large egg (, at room temp)
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1 tsp vanilla extract
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2 3/4 cups (250g) dark chocolate chips (/ semi-sweet choc chips, plus extra for decorating)
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1 2/3 cups (150g) milk chocolate chips