No Bake Rainbow Marshmallow Mousse Cake Recipe

Embrace the joy of color with the No Bake Rainbow Marshmallow Mousse Cake, a delightful dessert that’s as vibrant as it is delicious. This easy-to-make treat combines a crunchy graham cracker crust with a creamy, marshmallow-packed mousse, topped off with a sprinkle of rainbow colors. Perfect for parties, special occasions, or just a fun family dessert, this cake is sure to impress with its festive appearance and delightful taste.


For the Crust:

  • 8 3/4 ounces graham crackers
  • 8 tablespoons unsalted butter, melted

For the Marshmallow Mousse:

  • 2 cups rainbow marshmallows
  • 2 cups thickened/whipping cream
  • 1 cup white chocolate, melted
  • 2 tablespoons powdered gelatin
  • 4 tablespoons water
  • 1 teaspoon vanilla extract
  • 1 cup rainbow sprinkles (for decoration)


  1. Prepare the Crust:
    • In a food processor, process the graham crackers until fine crumbs form.
    • Add the melted butter and pulse until the crumbs are well coated.
    • Press the mixture into the bottom of a springform pan to form a crust. Chill while preparing the mousse.
  2. Make the Marshmallow Mousse:
    • In a small bowl, mix gelatin with water and let it bloom for a few minutes.
    • Melt the white chocolate and combine it with the bloomed gelatin mixture until smooth.
    • Whip the cream until stiff peaks form, then fold in the melted white chocolate mixture.
    • Gently fold in the rainbow marshmallows.
  3. Assemble the Cake:
    • Pour the mousse over the prepared crust.
    • Chill in the refrigerator until set, ideally overnight.
    • Before serving, top with rainbow sprinkles for a festive touch.


  • Ensure the cream is very cold before whipping to help achieve the best volume.
  • For a firmer set, ensure the gelatin is fully dissolved before adding to the chocolate.
  • Decorate with additional marshmallows or themed decorations for extra festivity.


  1. Can I make this cake a day ahead?
    • Yes, this cake benefits from setting overnight in the refrigerator, making it perfect for preparing a day ahead.
  2. How do I store leftover cake?
    • Keep any leftovers in the refrigerator, covered, for up to 3 days.
  3. Can I use mini marshmallows instead of rainbow marshmallows?
    • Absolutely! Mini marshmallows can be substituted; just choose colorful ones to maintain the festive look.

Prep Time: 40 minutes

Cook Time: 0 minutes

Total Time: 40 minutes (plus chilling time)

Yield: 12 servings

Category: Dessert

Method: No Bake

Cuisine: American

Diet: Vegetarian


The No Bake Rainbow Marshmallow Mousse Cake is the epitome of a festive, fun dessert that brings a burst of joy and color to any table. It’s simple to prepare, requires no baking, and provides a perfect combination of textures from the crunchy crust to the smooth, fluffy mousse. Ideal for celebrating any occasion, or simply bringing a smile to your loved ones’ faces, this cake is a delightful treat that’s as fun to make as it is to eat.

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