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1
Cream butter and both sugars together in mixer bowl until pale and fluffy, 3 minutes.
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2
Add eggs one at a time, beating between additions; mix in vanilla extract.
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3
Whisk flour, baking soda, and salt in separate bowl; fold into wet mixture until just combined.
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4
Fold in chocolate chips and walnuts; do not overmix.
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5
Drop rounded tablespoons onto parchment-lined baking sheets, spacing 5cm apart.
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6
Bake at 190°C for 12–14 minutes until edges set but centres still soft.
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7
Cool on baking sheet 5 minutes; transfer to wire rack.