Step 1

First, dump your gelatin powder into 6 individual containers. The containers need to be able to hold at least 1¼ cups of hot liquid.

Step 2

Next, stir 1¼ cups boiling water into each flavor. Stir each until gelatin is completely dissolved. You will want to position your glasses in opposite order of the rainbow as we will start with purple and end on red.

Step 3

Spray your 9x13 glass pan with cooking spray, this will help the Jello release easily once it is set.

Step 4

Take ¾ cup of your purple jello and set aside. Take the remaining purple jello (about ¾ cup) and add 1½ Tablespoons of the yogurt and stir until completely dissolved. Make sure there are no yogurt lumps left. Once the yogurt is completely dissolved, add to your 9x13 glass dish and then place in the refrigerator for approximately 15 minutes.

Step 5

Make sure you set a timer for each layer as knowing when to add the next layer is very critical. You must chill each layer long enough to partially set, but not too long otherwise the next layer will not adhere.

Step 6

Once your timer goes off, take your pan and remaining Jello out of the refrigerator. You will first want to test the gelatin in the pan to make sure it is set enough to take the next layer. You will test this by lightly touching the jello with a finger tip and lifting up right away.

Step 7

The jello should stick to your finger (not liquid) and leave a slight impression in the jello. If you have that, then you are ready to add your next layer.

Step 8

Now you want to add your clear purple mixture. With a spoon very GENTLY and SLOWLY add your Jello to the set jello layer. Make sure your spoon is nice and low when you are adding the yogurt mixture. This will ensure you don't break through the bottom layer when you pour it in. Place back into the refrigerator for another 15 minutes.

Step 9

Complete this same process with the rest of your colors. Red will be your last layer.

Step 10

The other jello colors can remain on the counter during this entire process.

Step 11

I have never had any of the waiting jello start to set. If this should happen though, simply fill a bowl with hot water and place your jello container inside of the water bowl and stir until the set jello loosens up and turns back into liquid.

Step 12

Your cooling time will lessen with each layer added as the cooler the jello gets, the less time it takes to set.

Step 13

Once you have added all 12 layers, let the Jello set overnight.

Step 14

Keep refrigerated.