Dissolve 2 envelopes of Knox gelatin with 2 cups of boiling water in a bowl. Mix with sweetened condensed milk. Mix well, and set aside. Will be approximately 3 cups.
Divide the 4 boxes of Jello into 4 separate bowls. Add 1/2 envelope of Knox gelatin to every bowl. Add 1 cup of boiling water to every bowl and stir the mixtures until well dissolved.
Spray a 13×9 pan lightly with oil. Carefully pour 1 bowl of jello mixture into pan. Place pan in freezer, making sure it's level, 8-10 minutes for the first layer, just until there is a light fingerprint when you touch the top.
Pour 1 cup condensed milk mixture on top, and freeze for 7 minutes.
Continue layering and freezing for 7 minutes for each layer. Don’t freeze too long between layers or they will not stick together as well.
If needed, microwave bowls of jello in 10-20 second increments, to keep from coagulation while you wait for each layer.
Once layers are done, cover and chill in fridge until fully set. Slice into squares with a sharp knife and serve on a platter, if desired.
Notes
This recipe requires a bit of patience, but the stunning result is worth it.
Spraying your pan with cooking oil before pouring in the first Jello layer will help the dessert removes easily when it's time to slice and serve.
Microwaving the Jello in short increments can help prevent it from setting while you wait for the previous layer to chill.
Make sure to cut the Jello into squares with a sharp knife for clean, neat edges when serving.
Experiment with different flavors to match a special occasion. You can use red, white, and blue Jello for Independence Day or shades of green for St. Patrick's Day, etc.
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