Graham cracker crust
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Preheat oven to 375F.
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Mix graham cracker crumbs, sugar, and butter in a small bowl. Press the crumb mixture into an 8″ – 9.5″ pie pan. Bake for 7 minutes. Cool for at least 30 minutes.
Key Lime Filling
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Preheat oven to 350F
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Whisk together sweetened condensed milk, sour cream, lime juice, and lime zest in a medium bowl. Pour into prepared graham cracker crust and bake for 10 minutes.
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Let pie cool slightly before chilling. Chill for at least 3 hours.
Whipped Cream Topping
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Beat heavy cream and sugar together in a mixer until stiff peaks form. Beat in vanilla. Spread or pipe the whipped cream on top of the cooled pie. Top with additional lime zest if desired.
