Sugar Spun Run Cookies

Instructions

1. 1.Brown 1 cup of unsalted butter in a light-colored saucepan, melting over low heat then raising to just above medium until the foam subsides and the milk solids turn golden brown. Scrape into a bowl and let cool to room temperature.
2. 2.Stir the brown sugar and granulated sugar into the cooled brown butter until combined, pressing out any sugar lumps.
3. 3.Mix in the room-temperature eggs and vanilla extract until smooth.
4. 4.In a separate bowl, whisk together the flour, cornstarch, baking powder, baking soda, and salt.
5. 5.Gradually add the dry ingredients to the wet in about four additions, mixing until no dry streaks remain, then fold in the chopped chocolate.
6. 6.Cover the dough and chill in the refrigerator for 30 minutes while preheating the oven to 350°F (175°C).
7. 7.Scoop the dough into 2 tablespoon (about 50 g) portions, roll into smooth balls, and place at least 2 inches apart on a baking sheet.
8. 8.Bake one tray at a time on the center rack for 10 to 12 minutes until edges are lightly golden and centers look slightly underdone, then sprinkle with flaky sea salt and cool completely on the baking sheet.