Shamrock Rice Krispie Recipe

Festive and fun for all ages, our Shamrock Rice Krispie Recipe will give your St. Patty’s day that something special! Minimal ingredients and an easy recipe, this is a yummy dessert that you can make with your littles for some good quality time or for just a lazy day Sunday baking.

We are always trying to come up with something fun to make when different holidays roll around. As my children get older, they ask more and more to help and become more involved with cooking. This recipe is great because it introduces some easy skills and allows them to be super hands-on. The aspect of incorporating the food coloring makes it really fun… so much so that my son acted like he was a mad-scientist as the white marshmallows turned green 🙂

Why do my rice krispie treats get hard?

Melting the marshmallows at high heat is the prime culprit for rock hard rice krispie treats. It will add a few more minutes of cook time, but melt the butter and marshmallows over low heat. It’s tempting to turn up the heat to speed up melting the butter and marshmallows! Try to resist the urge if you want the best possible outcome!

How long do rice krispie treats stay fresh?

Once the treats are cooled and you’ve cut them up, place them in an airtight container. Be sure to place a sheet of wax paper in between each layer to keep them from sticking together. They can be stored in a container at room temperature for 3-5 days, or frozen for up to 6 weeks. A big indicator that it’s time to toss the them is when they feel near impossible to bite into because they are hard.

Ingredients for our Shamrock Rice Krispie Recipe:

  • Crispy Rice Cereal (The off-brand tastes the same if 1/2 the price!)
  • Marshmallows
  • Butter
  • Green Food Dye

How to make our Shamrock Rice Krispie Recipe:

Turn a burner onto medium-low heat. Next, melt the stick of butter, stirring occasionally.

Once the butter is completely melted, turn heat to low and add all of your marshmallows to the pan.

As you go, constantly stir until completely melter and no bumps are present. You MUST keep stirring or else the mixture could burn. It may take a little longer at low heat, but this is crucial in keeping your treats from turning rock-hard!

Once completely melted, turn off the heat. Add food coloring, one drop at a time. After one drop, stir and combine ingredients completely. If you desire a darker color, add another drop of food dye and repeat. We used 4 drops of food dye to get the color in our Shamrocks!

Once you have achieved your desired color, slowly add all of the rice crispy cereal to the marshmallow mixture. Stir until completely combined.

Grease two 8×8 pans or one 13×9 baking dish. Add the mixture to the pans.

To make it easy and allow my children to help with this next part, I sprayed their clean hands with Pam so they could press down the mixture evenly without it sticking to them. If you try to use your hands and they aren’t greased, it will be a sticky nightmare! Be sure to move slowly at this part to so that the mixture isn’t too warm for their hands.

Once the mixture is in the pan the way you want it, let it set for 10-15 minutes.

Once the rice crispy mixture is set, let the kids start using their cookie cutters to create their shamrocks!!

They are ready to enjoy! Be sure to store in an air-tight container for up to 5 days! If they are left in open air too long, they will get super hard and won’t be nearly as good.

My kiddos absolutely loved making these! They liked seeing the marshmallows melt and turn green. They enjoyed getting their hands all greasy to work the mixture into the pan. And the ESPECIALLY loved eating them when we were done! My daughter was so proud, she even brought one to school for her sweet teacher. Rice Crispy treats aren’t a new idea by far. But making them uniquely yours and putting a special St. Patricks Day spin on them was new for us! Make sure you’re wearing something green on the 17th so you don’t get pinched! 🙂

Shamrock Rice Krispie Recipe

Shamrock Rice Krispie Recipe

Prep Time: 5 minutes
Cook Time: 10 minutes
Total Time: 15 minutes


  • 1 Stick of Butter
  • 4 Cups of Marshmallows
  • 6 Cups of Rice Crispy Cereal
  • 4 Drops of Green Food Dye


  1. Turn a burner onto medium-low heat.
  2. Melt the stick of butter, stirring while doing so.
  3. Turn burner to low and add all marshmallows. Stir constantly until fully melted.
  4. Next, add desired amount of food coloring and stir until fully blended.
  5. Turn heat off and add marshmallows. Stir until completely combined.
  6. Pour mixture into a greased baking dish and pat down with greased hands or wax paper.
  7. Let cool.
  8. Use cookie cutters to cut out shapes and then serve. Enjoy!

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