In a small bowl, mix graham cracker crumbs, melted butter, and sugar until combined. Press about 1 tablespoon of the mixture into the bottom of each 2-ounce shooter glass.

In a medium bowl, beat cream cheese and yogurt together until smooth. In another bowl, mix sweetened condensed milk with key lime juice, then combine with the cream cheese mixture until smooth.

Divide the creamy mixture in half and add green food coloring to one half. Use piping bags to layer the mixtures into the shooter glasses.

Refrigerate for at least 30 minutes to set. Garnish with whipped cream, lime zest, and graham cracker crumbs before serving.