Brown Butter Chocolate Chip Cookies

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1. 1Step 1: Brown the butter in a pan over medium heat, swirling, until it smells nutty and flecks turn brown, 5 to 6 minutes. Pour into a large bowl and cool 15 minutes.
2. 2Step 2: Whisk in both sugars, then the egg, yolk, and vanilla until glossy.
3. 3Step 3: Stir in the flour, baking soda, and salt, then fold in the chocolate.
4. 4Step 4: Chill the dough for 30 minutes for thicker cookies, or bake right away for flatter ones.
5. 5Step 5: Heat the oven to 375°F (190°C). Scoop 3-tablespoon balls onto lined sheets, 3 inches apart.
6. 6Step 6: Bake until the edges are golden and the centers still look soft, 10 to 11 minutes.
7. 7Step 7: Sprinkle with flaky salt and let them firm up on the sheet for 5 minutes.