Start by combining the lime jello mix with the boiling water in a medium mixing bowl. Stir continuously until the jello powder has completely dissolved with no granules remaining. This usually takes about 2-3 minutes of stirring.
Once the jello is fully dissolved, add the ginger beer and vodka to the bowl. Stir everything together until well mixed. The carbonation from the ginger beer might create some fizz, which is totally normal.
Fill your 2-ounce shot glasses about ⅔ of the way full with the jello mixture. This leaves room for your garnishes later. Carefully transfer the filled shot glasses to the refrigerator.
Let the shots chill in the fridge for at least 2 hours or until they're completely set. When ready to serve, garnish each shot with a fresh sprig of mint and a lime wedge for that classic Moscow Mule look. Enjoy immediately!
Notes
Keep liquids at room temperature - Make sure your ginger beer and vodka aren't too cold when mixing. Very cold liquids can cause the jello to start setting up prematurely while you're still filling the shot cups, which can give them an odd texture on top.
Don't worry about the fuzzy appearance - The carbonation from the ginger beer might give your shots a slightly fuzzy or cloudy look. This is perfectly normal and doesn't affect the taste at all.
Fill shots evenly - Use a measuring cup with a pour spout or a small ladle to fill your shot glasses evenly. This makes the process much faster and ensures consistent portions.
Garnish right before serving - Add your fresh mint and lime garnishes right before you're ready to serve the shots, not when you first make them. This keeps the garnishes looking fresh and vibrant.