Yield: Makes one 9-inch pie
Preheat oven to 325 degrees.
Mix graham crackers crumbs and sugar together. Melt the butter and blend well with the cracker crumbs. Press into a 9-inch pie pan. Use a smaller pie pan to press crumbs into the pan. Bake for about 6 minutes. Cool.
Using an electric mixer, combine the milk and egg yolks at low speed. Slowly add the key lime juice. Mix until well blended and mixture is relatively thick. Pour into prepared graham cracker crust and bake for 8-10 minutes. Cool and refrigerate until chilled.
Top mile high pie with freshly whipped cream and chopped walnuts and garnish with key lime slices.
Please note that some ingredients and brands may not be available in every store.