INGREDIENTS
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cooking spray (for greasing)
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1/2 cup unsalted butter
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1/2 cup semisweet chocolate (chopped)
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1/2 cup sugar
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1/2 cup dark brown sugar
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1 teaspoon vanilla extract
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2 large egg whites
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1/3 cup all-purpose flour
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1/4 cup cocoa powder
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1 teaspoon baking soda
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1/2 teaspoon salt
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flaky sea salt (for garnish)