"Served warm, these not-too-sweet brownies beg to go à la mode...."
INGREDIENTS
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Nonstick vegetable oil spray
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1 tablespoon natural unsweetened cocoa powder plus more for pan
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1/2 cup (1 stick) unsalted butter, cut into 1/2-inch pieces
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3 ounces unsweetened chocolate, chopped
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2 ounces bittersweet chocolate, chopped
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2/3 cup all-purpose flour
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1 tablespoon instant espresso powder
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1/4 teaspoon kosher salt
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2 large eggs
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1 cup sugar
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1 teaspoon vanilla extract
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1/3 cup bittersweet chocolate chips
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1/2 cup sugar
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2 tablespoons heavy cream
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2 tablespoons unsalted butter, cut into 1/2-inch pieces
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Gray sea salt or flaky sea salt (such as Maldon; for serving)