01 -
Preheat oven to 350°F. Line baking sheets with parchment.
02 -
Beat cold butter and sugar. Add vanilla and egg, mix briefly.
03 -
Mix in flour, cornstarch, baking soda and salt until soft dough forms.
04 -
Beat in chocolate and walnuts briefly.
05 -
Drop 1/4 cup portions of dough. Keep shape rough.
06 -
Bake 12-14 minutes until golden. Cool fully. Top with sea salt.