Preheat the oven to 350ºF and line a muffin tin with muffin liners. Spray with nonstick cooking spray.
Prepare the crust by processing graham crackers, Ritz crackers, and butter until crumbly.
Press the crumble into each muffin cup and bake for 5 minutes.
While the crust bakes, blend Greek yogurt until smooth. Add cream cheese, honey, vanilla, lemon juice, and lemon zest, blending until combined. Then, add the egg white and pulse until mixed.
Spoon cheesecake mixture into each muffin cup.
Top with lemon zest or graham cracker crumbs.
Bake for 10-12 minutes until firm.
Let cool for 15 minutes, then chill in the refrigerator for at least 2 hours before serving.