In a medium mixing bowl, combine graham cracker crumbs, melted butter, and white sugar until evenly mixed. Use a fork or spatula to ensure the mixture resembles wet sand. Grab about 2 tablespoons of the crust mixture and press it firmly into the bottom of each mini dessert jar.

In a large mixing bowl, beat together reduced-fat cream cheese and low-fat vanilla Greek yogurt until smooth. In a separate bowl, whisk the fat-free sweetened condensed milk and fresh key lime juice until blended. Fold into the cream cheese blend until combined.

Divide the lime filling into two bowls. If using, add green food coloring to one bowl, mixing until the desired shade is achieved.

Using a piping bag or a spoon, layer the filling into each dessert jar, alternating layers of plain and green colored filling until filled to the top.

Cover the mini dessert jars and refrigerate for at least 2 hours to allow the filling to set.

Before serving, top with whipped cream, lime zest, and crushed graham cracker crumbs. Arrange on a platter for an elegant presentation.