4 ounces chocolate wafer cookies, such as FamousChocolate Wafers (about 20)
Heat 4 cups of the milk in a large saucepan over medium heat until steaming.
Whisk the sugar, cornstarch and 1/2 teaspoon salt in a large bowl. Whisk in the egg yolks and the remaining 1/2 cup milk.
Whisk half of the hot milk into the egg mixture until smooth, and then gradually whisk the egg-milk mixture back into the saucepan. Cook over medium heat, whisking constantly, until the mixture boils. Continue to cook, whisking constantly, until it has thickened to a pudding-like consistency, 3 to 4 minutes. Remove from the heat and stir in the vanilla extract.
Cool slightly, stirring a few times to prevent a skin from forming. Place a piece of plastic wrap directly on top of the pudding and refrigerate until completely cooled and thickened, about 4 hours.
Before serving, whisk the pudding vigorously until smooth and creamy. 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. Reserve 1/2 cup of the crushed cookies and stir the rest into the pudding. Spoon the pudding into six to eight individual cups and top with the reserved crushed cookies.
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