INGREDIENTS
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21/2 cups all-purpose flour
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11/2 cups good cocoa powder
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21/4 teaspoons baking soda
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1/2 teaspoon salt
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1/2 pound (2 sticks) unsalted butter, at room temperature
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1 cup granulated sugar
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1 cup light brown sugar, packed
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3 extra-large eggs, at room temperature
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3 teaspoons pure vanilla extract
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1/2 cups buttermilk, at room temperature
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3/4 cup sour cream, at room temperature
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3 tablespoons brewed coffee
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24 ounces semisweet chocolate chips
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1 1/2 cups heavy cream
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2 tablespoons light corn syrup
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1/2 teaspoon pure vanilla extract
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4 tablespoons (1/2 stick) unsalted butter, at room temperature
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M&M's candy for decorating