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1
Heat 4 cups of the milk in a large saucepan over medium heat until steaming.
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2
Whisk the sugar, cornstarch and 1/2 teaspoon salt in a large bowl.
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3
Whisk in the egg yolks and the remaining 1/2 cup milk.
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4
Whisk half of the hot milk into the egg mixture until smooth, and then gradually whisk the egg-milk mixture back into the saucepan.
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5
Cook over medium heat, whisking constantly, until the mixture boils.
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6
Continue to cook, whisking constantly, until it has thickened to a pudding-like consistency, 3 to 4 minutes.
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7
Remove from the heat and stir in the vanilla extract.
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8
Cool slightly, stirring a few times to prevent a skin from forming.
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9
Place a piece of plastic wrap directly on top of the pudding and refrigerate until completely cooled and thickened, about 4 hours.
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10
Before serving, whisk the pudding vigorously until smooth and creamy.
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11
Put the cookies into a resealable plastic bag and lightly crush with the smooth side of a meat mallet or the bottom of a measuring cup.
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12
Reserve 1/2 cup of the crushed cookies and stir the rest into the pudding.
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13
Spoon the pudding into six to eight individual cups and top with the reserved crushed cookies.