Make the crust: Crush the cookies in a zip-top bag with a rolling pin or pulse in a food processor.
Mix with melted butter and a pinch of salt until it looks like damp sand.
Portion the base: Divide the crust evenly among 4 jars. Press down lightly with the back of a spoon. Set aside.
Beat the cream cheese: In a mixing bowl, beat softened cream cheese until smooth and fluffy, 1–2 minutes.
Scrape the bowl.
Add yogurt and flavorings: Mix in Greek yogurt, vanilla, lemon juice (if using), sweetener, and salt. Beat until silky and lump-free.
Mix in protein powder: Add the protein powder and mix on low until just combined. If the mixture is too thick, blend in almond milk 1 tablespoon at a time until creamy and spoonable.
Fold in cookie crumbs: Gently fold in 2 crushed cookies so you get a cookies-and-cream look without overmixing.
Assemble: Spoon the cheesecake filling over the crust in each jar.
Smooth the tops with a spoon or spatula.
Chill: Cover and refrigerate for at least 1 hour for a soft set, or 3–4 hours for a firmer bite.
Finish and serve: Top with a small dollop of whipped topping or yogurt and sprinkle with extra cookie crumbs. Enjoy cold.