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Export 7 ingredients for grocery delivery
Step 1
Preheat oven to 350F (175C) and line a 9x9" (23x23cm) baking pan with foil. Set aside.
Step 2
Combine graham cracker crumbs, sugar, and brown sugar in a large bowl.
Step 3
Add melted butter and stir well.
Step 4
Press evenly and firmly into the bottom and up the sides of prepared pan.
Step 5
Bake on 350F (175C) for 7-8 minutes. Allow to cool slightly while you prepare your key lime filling.
Step 6
In a large bowl, whisk together sweetened condensed milk, sour cream, and lime zest (if using) until mixture is smooth.
Step 7
Gradually whisk in key lime juice until mixture is smooth.
Step 8
Pour into prepared pie crust and bake for 8-10 minutes, until mixture is set if you jiggle the pan.
Step 9
Remove from oven and allow to cool to room temperature, then transfer to refrigerator and allow to chill 4-6 hours before cutting.
Step 10
Top with whipped cream, if desired, and serve.