Browning the butter is the single change that takes a good chocolate chip cookie to a genuinely great one — the milk solids toast in the pan and add a nutty, caramel-like depth that regular melted or softened butter can't match.
It adds maybe 10 extra minutes to the process, mostly hands-off, for a cookie that tastes noticeably more complex.
Watch the butter closely once it starts foaming — it goes from perfectly browned to burnt in under a minute, and burnt butter tastes bitter, not nutty.
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Melt the butter in a light-colored saucepan over medium heat, swirling occasionally, until it foams, then turns golden brown and smells nutty, about 5-7 minutes. Pour into a heatproof bowl to cool for 15-20 minutes.
Whisk together flour, baking soda and salt in a bowl.
Whisk the cooled brown butter with both sugars until combined. Whisk in the egg, egg yolk and vanilla until smooth.
Fold the dry ingredients into the wet mixture until just combined, then fold in chocolate chips. Chill the dough for at least 30 minutes — this helps the flavor develop and prevents excess spreading.
Preheat oven to 375°F (190°C). Scoop dough onto a lined baking sheet, spaced 2 inches apart, and bake for 9-11 minutes until the edges are set. Sprinkle with flaky salt if using.
Watch for the color to shift to an amber-gold and the smell to turn nutty rather than sharp — it happens quickly after the foaming stage, so stay at the stove and swirl the pan constantly toward the end.
The butter is liquid after browning rather than creamed cool and soft, so chilling solidifies it again — skipping this step results in cookies that spread thin and greasy.
The extra yolk adds richness and chewiness that a single whole egg doesn't fully replicate — it's a small but noticeable difference in texture.