1 cup (227 g) unsalted butter, melted and slightly cooled 1 cup (200 g) packed light brown sugar 1 / 2 cup (100 g) granulated sugar 1 large egg 1 large egg yolk 2 tsp (10 ml) pure vanilla extract 2 1 / 4 cups (280 g) all-purpose flour 1 tsp baking soda 3 / 4 tsp kosher salt (or 1 / 2 tsp fine sea salt) 1 1 / 2 cups (255 g) semisweet chocolate chips, plus a few extra for topping Flaky sea salt, for sprinkling (optional) Vanilla ice cream, for serving (optional)
Preheat oven to 350°F (175°C). Lightly butter a 10-inch cast-iron or oven-safe skillet; line the bottom with a round of parchment if desired. In a large bowl, whisk melted butter, brown sugar, and granulated sugar until smooth and glossy, about 1 minute. Whisk in the egg, egg yolk, and vanilla until well combined. In a separate bowl, whisk together flour, baking soda, and salt. Add dry ingredients to the wet and fold just until a thick dough forms; do not overmix. Fold in the chocolate chips. Scrape dough into the prepared skillet and press into an even layer. Sprinkle a few extra chips on top and a pinch of flaky sea salt if using. Bake 20–25 minutes, until the edges are deep golden and the center is set but still soft; a toothpick inserted 2 inches from the edge should come out with a few moist crumbs. For extra-gooey, bake closer to 20 minutes; for sliceable, 23–25 minutes. Cool in the skillet on a rack for 10–15 minutes. Serve warm straight from the skillet with scoops of vanilla ice cream, if desired.
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