Get five similar-sized glass or plastic containers and pour one pack of Jello into each of them.
Boil water on the stove or microwave and add 1 cup boiling water to each container. Stir well until all Jello powder has dissolved.
Place containers in the fridge and chill until they become solid--at least 3-4 hours or overnight.
After the multiple flavors have chilled and set, it's time to make the white part of the Jello.
In a medium-sized mixing bowl, dissolve the 2 envelopes of Knox gelatin into two cups of very hot water. Once completely dissolved, pour in the can of sweetened condensed milk. Mix well.
This mixture will need to cool a bit. While it is cooling, get the 5 chilled Jellos out of the fridge. Cut them into small squares and pour them into a 9x13 glass dish. (See pictures in step-by-step photos above.)
When the white Jello is no longer hot--you don't want it to melt the colored Jello pieces--pour it over the colored Jello pieces and give it a gentle stir to ensure equal distribution.
Carefully place the Jello into the fridge and chill until completely solid--6-7 hours or overnight.
Enjoy!
Recipe by Real Life Dinner at https://reallifedinner.com/broken-glass-jello-squares/