Preheat the oven to 350°.
Choose the jar sizes you'll be using, 4 oz or 8oz short jars. The 4 oz is a nice snack size, the 8 oz is a generous portion.
Prepare the glass jars with a nonstick baking spray or pan release (homemade recipe linked in post).
Prepare the pie crust by mixing the graham cracker crumbs iwth melted butter, with brown sugar, salt, and cinnamon. Mix with a fork or pastry cutter to blend everything together well.
Place a heaping tablespoon of crust mixture into each jar. Distribute the crust evenly amongst the jars, then press it firmly into the bottom of the jars with a tart press, the back of a spoon, or a small solid item that will fit into the jars like the lid of something, and press the crust firmly.
Bake the pie crust in the jars for 8 minutes.
In a medium bowl or large measuring cup, place the sweetened condensed milk, egg yolks, sour cream, lime juice, lime zest, cornstarch, and salt Mix with a whisk until well blended and smooth.
Pour the filling into the prepared jars with the pie crust.
Bake for 20 minutes and test the filling with a knife. The filling should be set and will wiggle a bit, but appear thick and cooked. It'll thicken upon cooling like any pudding would.
Cool at room temperature, then place the jars in the fridge until they are completely cold. 4 hours to overnight.
Mix the whipped cream firm, place in a piping bag, and top each jar with whipped cream, then add slices of lime. Serve or place in the fridge to serve later.