Using a sharp knife, carefully make a small hole (or make an existing one a little larger) at the top of the plastic Easter egg.
Brush the inside of the plastic egg with vegetable oil.
Put the two sides of the egg together and seal the seams using scotch tape. A lot of the plastic Easter eggs have drainage holes; be sure to cover those with tape, too. Set in the holder and aside for now. Leave open the hole that you made (or made larger).
In a small bowl, stir the contents of the jello package and the gelatin.
Add the boiling water and whisk until fully dissolved.
Add the vodka and stir a couple of times.
Using the food-safe syringe, fill each egg through the hole at the top of the egg. Carefully fill to the top. A standard, small-size plastic egg holds approximately 60 milliliters or 2 ounces. Once filled, place in the fridge until the jello sets, approximately 1.5- 2 hours.
Carefully remove the tape and break open the egg.
Remove the jello shot and enjoy!
Notes
Be sure to use a really good tape and be sure that it has no openings or seams. The jello is warm when it is put into the eggs and can leak if the tape is not really adhered.
The shots will keep in the fridge for 5 days. After that, the gelatin starts to break down. Keep refrigerated when not serving.
A food-safe syringe is not entirely necessary. A small funnel will do the job but I found that the syringe creates less mess. Jello can be very sticky.
You can easily make an alcohol free version by substituting the vodka for a cup of room temperature water.