Graham cracker crust
1 1/2 cups graham cracker crumbs
1/3 cup granulated sugar
6 tbsp butter melted
Key Lime Filling
28 oz sweetened condensed milk
1/2 cup light sour cream
3/4 cup key lime juice
Zest from 2 regular limes or 4 key limes
Whipped Cream Topping
1 cup heavy whipping cream
1/2 cup powdered sugar
1 tsp vanilla extract