INGREDIENTS
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1 nine-inch frozen ready-to-bake deep-dish pie shell, thawed
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1 cup granulated sugar
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1/3 cup unsweetened cocoa
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1/3 cup cornstarch
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1/4 teaspoon salt
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2 3/4 cups milk
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2 tablespoons plus 1 teaspoon coffee-flavored liqueur, divided
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1 tablespoon butter
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1 teaspoon vanilla extract
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1 cup (1/2 pint) heavy cream
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2 tablespoons confectioners' sugar