Preheat oven to 350 degrees.

Using a food processor, grind graham crackers into crumbs.

Place crumbs in a bowl and add butter and sugar. Mix well.

Put foil cupcake liners into the cupcake pan.

Divide crumbs evenly between foil cups. About 1 Tablespoon each. Press firmly into the bottom.

In a separate bowl throughly combine eggs, sweetened condensed milk, lime juice, zest, and greek yogurt.

Fill the baking cups about 1/4" from the top of the liner and bake for 12-15 minutes.

Cool completely. Garnish with whipped cream

Keep refrigerated.