Lightly coat the inside of each shot glass with a little non-stick spray. Do NOT overspray!
To a medium mixing bowl, add the lemon jello, 2 packets of unflavored gelatin, and 2 cups of boiling water. Stir until the gelatin is dissolved. Pour in 1/4 cup of vodka and stir.
Pour the lemon jello into the bottom of each shot glass so that it's about 1/3 full. Place the cups onto a baking sheet and chill in the fridge for 20-30 minutes until the jello is set.
To a medium mixing bowl, add the orange jello, 2 packets of unflavored gelatin, and 2 cups of boiling water. Stir until the gelatin is dissolved. Pour in 1/4 cup of vodka and stir.
Pour the orange jello into each shot glass so that they're about 2/3 full now. Place the cups back into the fridge for another 20-30 minutes until the orange jello is set.
To a medium mixing bowl, add the sweetened condensed milk, 2 packets of unflavored gelatin, and 1 cup of boiling water. Stir until the gelatin is dissolved. Pour in 1/4 cup of vodka and stir.
Pour the white jello into each shot glass so that they're full, and then pop the cups back into the fridge for another 20-30 minutes until completely set.
Keep the shots in the fridge until ready to serve. You can top these shots with whipped cream, candy corn, and Halloween-colored sprinkles if desired. If using whipped cream, add this right before serving so the gelatin doesn't melt it.
Notes
You can also use 2-ounce plastic cups with lids instead of glasses if you're taking these shots to a party.