Instructions
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In a mixing bowl, whisk the Jell-O powder with 1 cup boiling water until fully dissolved.
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Let it sit 2–3 minutes, then stir in 1 cup Fireball whiskey.
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Pour the mixture into the cups, filling each about three-quarters full.
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Chill in the refrigerator for 2–4 hours, or until fully set.
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Serve cold. Add optional toppings right before serving.