Fun Halloween Rice Krispie Treats with Marshmallow Frosting

Fun Halloween Rice Krispie Treats with Marshmallow Frosting

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Make a fun Halloween twist on a traditional Rice Krispie squares.  Add a fluffy homemade marshmallow top decorated with all your favorite shapes of Autumn candy corn.  Both the Rice Krispie treats and the marshmallow frosting are so easy to make.  Get all the kids involved in a fun kitchen Halloween activity.

Check out the the original Rice Krispie treat recipe.


Units Scale
  • 1 package of 10 oz marshmallows
  • 3 tablespoons of butter
  • 6 cups of Rice Krispies

Homemade Marshmallows

  • 3 (1/4 oz) packet of Knox Unflavored Gelatin
  • 3/4 cup of cold water (1/2 cup of water for the gelatin, & 1/4 cup water to be heated with the sugar)
  • 2 cups granulated sugar
  • 2/3 cup light corn syrup
  • 1/4 tsp salt
  • 2 tsp vanilla extract

For Your Pan:

  • Butter or spray oil


  1. Line a high sided 13 x 9 baking dish with parchment paper, leave about 2 to 3 inches over the edge. Butter or spray with spray oil on the parchment.  This allows you to be able to lift out the treats and cut them so they can be removed form the parchment paper

Rice Krispie Treats:

  1. Melt the 3 table spoons of butter in a large sauce pan on the stove.
  2. Add the bag of marshmallows and stir until melted.
  3. When melted add the Rice Krispies to the pot and stir to coat all of the cereal.
  4. With a spatula spread the Rice Krispie treats in the prepared pan, set aside.

Homemade Marshmallows:

  1. First, combine 1/2 cup of cold water & 3 packets of Knox Unflavored Gelatin in the bowl of the stand mixer. Let sit for 10 minutes.
  2. Next, in a saucepan mix together 2 cups of sugar, 2/3 cup of light corn syrup and 1/4 cup of water. Stir together. Over medium heat bring to a boil, stirring occasionally. When at a boil, boil rapidly for 1 minute. Turn off and let cool for 2 minutes.
  3. When the 10 minutes timer is over for the gelatin & water, turn on the mixer on low to break up the gelatin.
  4. With the mixer on low slowly and carefully take the cooled sugar mixture and pour into the mixing bowl.
  5. Add the 1/4 tsp of salt to the mixing bowl.
  6. Increase the speed of the mixture to high and mix for 6-8 minutes. (watch mixture to make sure it does not become too stiff your you will not be able to spread the marshmallows in your pan on top of the Rice Krispie treats.
  7. When the right spreadable consistency, slowly add the vanilla.
  8. Spread the Marshmallows over the rice Krispie treats.
  9. All the bars to cool, about 30 minutes
  10. When cool and the marshmallow is set remove by lifting the parchment paper out of the pan.
  11. You can decorate with Candy Corn before or after it cools.
  12. Cut into squares or any shape you like.


Keywords: Halloween Rice Krispie Treats with Marshmallow Frosting