20min · 8 servings For The Crust • 1 ½ cups (150 g) graham cracker crumbs, about 9 whole crackers or 1 full sleeve • ¼ cup (50 g) granulated sugar • 5 tablespoons unsalted butter, melted For The Filling • 28-ounces (792 g) sweetened condensed milk • 1 tablespoon lime zest • ¾ cup (180 ml) fresh key lime juice, about 25 key limes • ½ cup (113 g) plain Greek yogurt For Garnish • whipped cream, if desired • lime zest, if desired