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Sprinkle gelatin over 1/4 cup water in a microwave safe bowl, let stand until softened, 5 minutes.
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Heat in microwave for about 10 seconds, stir until completely dissolved.
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Meanwhile, whisk or beat heavy cream until soft peaks form. Set aside.
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Place eggnog in a large bowl and add dissolved gelatin and vanilla. Whisk until well combined.
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Whisk in 1/3 of the whipped cream into eggnog mixture. Carefully fold in remaining cream.
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Divide mixture into serving cups and refrigerate at least 6 hours or overnight.