Step 1

In a 9.25 inch deep dish pie plate, combine the graham cracker crumbs, brown sugar, ground macadamia nuts, salt, and melted butter. Stir with a fork until evenly mixed. Firmly press the crumbs into the pie plate and up the sides using a measuring cup. Place in the refrigerator for 30 minutes to set.

Step 2

In a large bowl, blend the sweetened condensed milk, softened cream cheese, and sour cream with an electric mixer on medium speed until smooth. Mix in the key lime juice. Place the bowl in the refrigerator while you make the whipped cream filling.

Step 3

In a medium sized bowl, combine the heavy whipping cream, powdered sugar, and lime zest and whip on high speed until stiff peaks form. Remove the filling mixture from the refrigerator and fold in the whipped cream using a spatula.

Step 4

Pour the filling into the set pie crust and place back in refrigerator for at least 6 hours. Decorate as desired with additional whipped topping, lime slices, and lime zest.