These giant levain cookies feature nutty brown butter, melty chocolate chips, and crunchy walnuts for a bakery-style treat with crispy edges and a chewy center.
Chilling the dough is optional but recommended for thicker, chewier cookies. Watch the butter carefully when browning to avoid burning. Avoid overmixing the dough to keep cookies tender. If cookies spread too thin, chill dough longer or add a tablespoon more flour.
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