Ingredients
- 1 cup unsalted butter (8 ounces), softened, divided
- 2 3/4 cups all-purpose flour (about 11 3/4 ounces)
- 2 teaspoons kosher salt
- 1 teaspoon baking soda
- 1/2 teaspoon baking powder
- 1 cup dark brown sugar
- 1 cup granulated sugar
- 1 large egg , at room temperature
- 1 tablespoon vanilla paste or vanilla extract
- 1 (4-ounce) milk chocolate bar , chopped (about 3/4 cup)
- 1 (4-ounce) white chocolate bar , chopped (about 3/4 cup)
- 2 (4-ounce) 60% cacao bittersweet chocolate bars , chopped (about 1 1/2 cups), divided
- 1/2 teaspoon flaky sea salt (such as Maldon)
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