This rainbow Jello poke cake is a classic recipe that has been around for a long time. It makes a perfect rainbow cake for any rainbow party and the flavors can be switched up in an endless variety of ways!
Begin by baking the cake as directed on the box, using a 9x13 pan. Allow it to cool for one hour.
Use the end of a wooden spoon to poke holes all around the top of the cake. To achieve a rainbow in every slice space holes about ½” apart.
Bring 6 cups of water to a boil. Divide into 6 equal portions and add 1 Jello mix to each cup of boiling water. Stir until the Jello has completely dissolved. Add 1/8 cup of cold water to each cup of boiling water and stir together.
Carefully pour each color over the cake. Be careful to keep the colors separate so they don’t mix by pouring one color at a time in rows of holes and then do the next color. Using a squeeze bottle helps control where it goes. You may have liquid leftover, that’s okay.
Chill at least 3 hours or overnight in the fridge. If you are in a hurry, put the poke cake in the freezer for half an hour instead!
Frost the cake with Cool Whip frosting and add rainbow sprinkles.
Store any leftovers in a covered container in the fridge. Cake will last for several days.
Change Up The Flavors In Your Poke Cake - You can make this poke cake recipe with any different flavors! Use any kind of cake mix and Jello flavors to change it up. You could try a chocolate cake with cherry Jello or a funfetti cake mix with blue raspberry Jello. The possibilities are endless! You can also use a strawberry sauce or any kind of fruit sauce in place of the Jello.
Other Frosting Options - There are other ways to frost your Jello poke cake too! You can mix a 3 oz box of any flavor Jello into the Cool Whip to flavor and color the frosting. You could also add prepared vanilla pudding whipped into the Cool Whip and then frost the cake.
Can You Make a Gluten-Free Poke Cake? - Yes! You can make a gluten-free poke cake using this recipe. Just replace the box cake mix with a gluten-free box cake mix like Betty Crocker gluten-free cake mix. Use fruit sauce in place of Jello if desired and top with fresh whipped topping.
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