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Capitol Hill Cooks | Rainbow crispy marshmallow treats, inspired by Pride

It’s a weekend for rainbows, happiness, and Pride on Capitol Hill. Families of every stripe, and especially kids and the young at heart, will be tickled by these festive rainbow treats. And even those who can’t stomach the idea of frosted, marshmallow-coated Trix have to admit that they’re darn cute.

2012 Capitol Hill Pride

Rainbow cereal. Marshmallow goo. Frosting. Sprinkles. CakeSpy Jessie Oleson sure knows how to go all-out in the dessert department. This recipe, from her book CakeSpy Presents Sweet Treats for a Sugar-Filled Life, is a multi-hued wonder, with enough sugar to keep you dancing all day long. You can also prepare this treat as a tribute to the soon-to-close CakeSpy Shop.

There are no complicated cooking techniques here. Just make a pan of crispy cereal treats, sandwich them with a slather of rich frosting, and roll the edges in rainbow sprinkles. Feed them to the ones you love. As Jessie herself says, “If you are what you eat, then eaters of these treats are colorful, rich, and absolutely fabulous.”

Rainbow Crispy Marshmallow Treats
adapted from Jessie Oleson’s CakeSpy Presents Sweet Treats for a Sugar-Filled Life

3 Tb. butter
4 c. miniature marshmallows
6 c. rainbow-colored cereal, such as Trix
2 c. Vanilla Buttercream frosting (recipe below)
Rainbow sprinkles

Butter a 9×13” pan. Melt butter over low heat in a wide pot, then add marshmallows and stir until melted. Remove from heat and immediately stir in the cereal until completely coated. Press the cereal mixture firmly and evenly into the buttered pan using buttered waxed paper or slightly damp, clean hands. Set aside to cool completely, then cut into squares.

You could stop there, of course, but why? Use a sharp knife to slice each square in half horizontally. Spread the bottom half with frosting and replace the top half to form a sandwich. Pour rainbow sprinkles onto a plate and dip the exposed frosting edges for the full double rainbow experience.

Vanilla Buttercream Frosting

1 stick softened butter
3-4 c. powdered sugar, sifted
2 Tb. heavy cream
1 tsp. vanilla extract

In a stand mixer or bowl, beat butter on medium speed until light and fluffy. Add 2 c. powdered sugar and mix on low speed until smooth. Scrape down the bowl and add cream and vanilla. Continue to beat on medium speed, adding additional powdered sugar a little at a time until the frosting reaches your desired consistency.


Capitol Hill Cooks is a home cooking recipe series featuring ingredients, ideas, and recipes from the neighborhood. Have a recipe you think we should share? Drop us a line at Em also writes about home cooking at

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