01 - Line a rimmed baking sheet (about 9x13 inches) with parchment paper.
02 - In a mixing bowl, combine the Greek yogurt, honey, lime zest, lime juice, and vanilla extract. Whisk until smooth and creamy.
03 - Pour the yogurt mixture onto the prepared baking sheet and spread it evenly into a rectangle about 1/2 inch thick.
04 - Sprinkle the crushed graham crackers evenly over the yogurt surface. Scatter white chocolate chips, sliced almonds, and additional lime zest on top if desired.
05 - Transfer the baking sheet to the freezer and freeze for at least 3 hours, or until the bark is fully set and firm.
06 - Once frozen solid, lift the bark out of the pan using the parchment paper overhang. Break or cut into serving-sized pieces.
07 - Serve immediately. Store any leftover bark in an airtight container in the freezer for up to 1 month.