Combine the sugar and meringue powder in a stainless steel bowl and whisk to combine. Mix egg whites and corn syrup. Combine the egg white mixture with the sugar mixture and whisk vigorously. Heat mixture over a hot water bath, stirring occasionally. The meringue is ready when the sugar is dissolved. Whip in a mixer fitted with a whisk attachment for 10 to 15 minutes. Slowly add the cool, room temperature butter and shortening. Add the vanilla seeds and then fold in the crushed cookies.
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