Combine graham cracker crumbs, melted butter, and sugar in a bowl. Press the mixture into dessert glasses to form the crust.

Beat the reduced-fat cream cheese using an electric mixer until smooth. Gradually add the low-fat vanilla Greek yogurt.

Whisk fat-free sweetened condensed milk and key lime juice together before folding into the cream cheese mixture.

Optionally, divide filling and add green food coloring to one portion, folding gently.

Layer the plain and colored fillings into the dessert glasses.

Cover with plastic wrap and chill in the refrigerator for at least 2 hours.

Garnish with whipped cream, lime zest, and graham cracker crumbs before serving.