In a medium sied bowl, combine graham cracker crumbs, melted butter, and the pinch of salt if used. Mix together with a spoon and press into the bottom and up the sides of a 9 inch pie plate.
Bake crust for 5-7 minutes or until toasty on the edges.
For the filling:
Mix together the sweetened condensed milk, sour cream, and lime juice. Pour into finished pie crust and bake for 10-12 minutes, or until little bubbles form on the surface of the pie and start to pop. (Don't let the pie get brown!)
Allow the pie to chill for a few hours/overnight.
To serve:
Beat heavy cream to stiff peaks and stir in the powdered sugar. Spoon over pie and top with lime zest.
Notes
*If you can't find fresh key limes, bottled key lime juice works great. I have also used fresh lime juice in a pinch.
Recipe adapted from All Recipes
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