Preheat your oven to 325°. Take your graham crackers and blend them in the food processor until they are fine crumbs. Mix your sugar into the crumbs. Then pour your melted butter in slowly while stirring.
Lightly coat the inside and bottom of a mini cheesecake pan (the kind where the bottoms pop out) with cooking spray. Spoon your mixture evenly into each compartment. Use your fingers to press the crumbs down into the pan. Bake for 10 minutes in the oven. Then let them completely cool.
Heat your vodka in a small pan over medium heat. Once the liquid starts to simmer, slowly whisk in your Jell-O.
Once all the Jell-O has dissolved, remove the pot from the heat and pour in the milk and half and half. Stir to combine.
Place your pan of cooled graham cracker crusts on a flat baking sheet (to catch any leaking jello), and pour the jello evenly into each compartment.
Quickly place in the refrigerator and let sit for 2 hours until set.
Once set, push up from the bottom of each compartment to free your jello shots, and you’re ready to serve!