Preheat your oven to 350°F (175°C). Place crusts on a baking sheet.
In a bowl, whisk sweetened condensed milk, sour cream, Key lime juice, and Key lime zest until smooth. Divide and pour mixture into crusts, filling each to the top.
Bake in the preheated oven for 5 to 8 minutes until hot. Chill in the fridge for at least an hour to achieve that irresistible chill.
Garnish each pie with a slice of Key lime and a dollop of whipped cream.
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