In a mixing bowl, combine graham cracker crumbs, melted butter, and white sugar until the mixture resembles wet sand. Press the crumb mixture firmly into the bottom of mini dessert glasses.

In a separate bowl, beat softened cream cheese and low-fat vanilla Greek yogurt using a hand mixer until smooth and creamy.

In another bowl, whisk together the fat-free sweetened condensed milk and key lime juice until well combined. Gently fold this mixture into the cream cheese blend.

Divide the filling mixture into two bowls. In one bowl, add a few drops of green food coloring and mix. Keep the second bowl plain.

Layer the fillings into the prepared dessert glasses, starting with the plain filling and then adding the colored filling. Repeat until the glasses are filled.

Cover with plastic wrap and refrigerate for at least 2 hours for the filling to set.

Once chilled, add garnishes such as whipped cream, lime zest, and crushed graham crackers.