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- Preheat oven: Set your oven to 350°F (175°C).
- Combine ingredients: In a bowl, whisk together condensed milk, key lime juice, sour cream, and lime zest until well combined.
- Pour into crust: Pour the filling into the prepared graham cracker crust.
- Bake: Place the pie on a baking sheet and bake in the preheated oven for 5-8 minutes, or until tiny bubbles form on the surface. The filling should be slightly set but still wobbly.
- Cool and chill: Let the pie cool completely on a wire rack, then chill in the refrigerator for at least 1 hour before serving.
- Serve: Garnish with lime slices and whipped cream, if desired.
