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In a very large, deep mixing bowl, combine the Froot Loops, Cap'n Crunch, and Rice Krispies cereals. Stir thoroughly with a large spoon to ensure an even mix of all three cereals. Set aside.

In a large, heavy-bottomed pot, melt the unsalted butter over low heat. Once the butter is fully melted, add the mini marshmallows to the pot. Stir continuously with a heatproof spatula or wooden spoon until the marshmallows are completely melted and the mixture is smooth and gooey.

Remove the melted butter and marshmallow mixture from the heat. Immediately pour the combined cereal mixture from the large bowl into the pot with the melted marshmallow mix.

Working quickly, stir the cereal and marshmallow mixture with your spatula or spoon until all the cereal is evenly coated with the sticky marshmallow mixture.

Transfer the entire mixture into a deep glass baking pan (a 9x13 inch pan works well for standard thickness).

Use the leftover butter wrapper (butter-side down) or a piece of parchment paper to firmly press the cereal mixture into the pan. This technique helps to compress the treats without them sticking to your hands or utensils, ensuring a very firm final product.

Allow the treats to cool and set completely at room temperature for at least 1 hour before cutting into squares and serving. For faster setting, you can place the pan in the refrigerator for about 30 minutes.


In a very large, deep mixing bowl, combine the Froot Loops, Cap'n Crunch, and Rice Krispies cereals. Stir thoroughly with a large spoon to ensure an even mix of all three cereals. Set aside.

In a large, heavy-bottomed pot, melt the unsalted butter over low heat. Once the butter is fully melted, add the mini marshmallows to the pot. Stir continuously with a heatproof spatula or wooden spoon until the marshmallows are completely melted and the mixture is smooth and gooey.

Remove the melted butter and marshmallow mixture from the heat. Immediately pour the combined cereal mixture from the large bowl into the pot with the melted marshmallow mix.

Working quickly, stir the cereal and marshmallow mixture with your spatula or spoon until all the cereal is evenly coated with the sticky marshmallow mixture.

Transfer the entire mixture into a deep glass baking pan (a 9x13 inch pan works well for standard thickness).

Use the leftover butter wrapper (butter-side down) or a piece of parchment paper to firmly press the cereal mixture into the pan. This technique helps to compress the treats without them sticking to your hands or utensils, ensuring a very firm final product.

Allow the treats to cool and set completely at room temperature for at least 1 hour before cutting into squares and serving. For faster setting, you can place the pan in the refrigerator for about 30 minutes.
