Bring 1 cup water to a boil in a small saucepan. Remove the hot water from the heat and whisk in the green Jello powder, stirring until completely dissolved.
1 box lime jello
Add ½ cup of cold water and ½ cup vodka to the green gelatin mixture and stir to combine.
4 cups water, 1 ½ cups vodka
Divide the green Jello mixture evenly between 3 oz. plastic shot cups, filling each one about ⅓ full. Move the cups to the refrigerator to chill for 2 hours.
Whisk together 1 cup water and 1 packet of Knox gelatin in a medium saucepan. Heat until just boiling.
2 1/2 teaspoons Knox unflavored gelatin
Remove from the heat and pour in vodka and sweetened condensed milk. Stir to combine. Allow the mixture to cool completely.
12 ounces sweetened condensed milk, 1 ½ cups vodka
Once the mixture has cooled, pour it into your Jello shot cups on top of the green layer. Each cup should now be about ⅔ of the way full. You can discard any remaining white gelatin mixture.
Move the cups back to the refrigerator to chill for another 2 hours.
To make the final layer, bring 1 cup of water to a boil. Remove from the heat and add the orange Jello mix, whisking until dissolved.
1 box orange jello, 4 cups water
Add ½ cup cold water and ½ cup vodka, then stir to combine. Allow the orange Jello mixture to cool completely.
4 cups water, 1 ½ cups vodka
Once the Jello has cooled, fill your shot cups the remainder of the way with the orange layer. Move the cups back to the refrigerator to chill for 2 more hours, or until ready to serve.
Before serving, top with whipped cream and orange and green sprinkles.
Whipped cream for topping, Green and orange sprinkles for topping
Notes
It's always a little tempting but be sure you don't add too much vodka or your Jello cups may not set.