In your stand mixer bowl (or a large bowl with a hand mixer) cream the cream cheese and sweetened condensed milk until creamy.
Add the key lime juice and zest. Beat on high for 2-3 minutes until it's fluffy and smooth.
Gently fold in the Cool Whip, starting at two cups, taste and adjust) and work up to three.
Sprinkle 1/4 cup of the graham cracker crumbs on a pie plate or serving bowl, scoop the key lime dip over top and garnish with the rest of the crumbs and key lime zest.