Rice Krispie Treat Recipe: Soft, Chewy Marshmallow Squares

By Aquarium Guides Editorial Team · Updated November 10, 2026

Last Updated: November 10, 2026

Rice Krispie treats need just three ingredients, a pot and about 10 minutes, yet they can turn out rock-hard or stiff if the details are off. The difference between a chewy, soft bar and a dense one comes down to the marshmallow-to-cereal ratio, the heat level and how firmly you press the mixture into the pan. This recipe gives a reliable ratio, a brown butter option and tips on fixing problems.

Ingredients

This makes 16 squares in a 9×13-inch pan (for thicker bars, use a 9×9-inch pan and cut 12).

• 4 tablespoons (1/2 stick) unsalted butter, plus more for greasing
• 1 package (10 ounces) regular-size marshmallows, about 40, or 5 cups mini marshmallows
• 1/2 teaspoon pure vanilla extract
• 1/4 teaspoon kosher salt
• 6 cups crispy rice cereal (such as Rice Krispies)
• 1 cup extra mini marshmallows, to fold in at the end (optional but makes them chewier)

Instructions

1. Grease a 9×13-inch baking pan with butter or line it with parchment, leaving an overhang on two sides for lifting the bars out later.
2. Measure the cereal into a very large bowl so it is ready to go. The marshmallow mixture sets fast.
3. Melt the butter in a large pot or Dutch oven over low heat. Stirring frequently, let it melt completely, about 2 minutes.
4. Add the marshmallows and stir constantly with a silicone spatula until they melt into a smooth mixture, 4 to 6 minutes. Keep the heat low to prevent scorching, which makes the treats hard.
5. Remove the pot from the heat and quickly stir in the vanilla and salt.
6. Pour in the cereal and fold gently, scraping the bottom of the pot, until every piece is coated. Fold in the extra mini marshmallows during the last few turns.
7. Transfer to the prepared pan. Press the mixture evenly into the pan with a buttered spatula or a sheet of wax paper. Press gently; compressing too hard packs the cereal and makes the bars dense.
8. Let cool for 30 minutes at room temperature before cutting into squares with a lightly greased knife.

Why the Ratio Matters

The classic box recipe calls for 3 tablespoons of butter, 1 package of marshmallows (10 ounces) and 6 cups of cereal. That gives a bar that is crisp but fairly firm. This version slightly increases the butter and adds extra mini marshmallows, which keeps the texture softer and chewier. If you prefer a gooier bar, use a 16-ounce bag of marshmallows with the same 6 cups of cereal.

Tips for Soft, Chewy Treats

Use low heat

Overheated marshmallow turns caramelized and sets rock hard when cooled. Keep the burner on low and remove the pot as soon as the marshmallows are smooth.

Use fresh marshmallows

Old, stale marshmallows are dry and do not melt as smoothly. A fresh bag is soft and squishy when pressed.

Do not pack the pan

Pressing hard compresses the cereal. Use buttered hands or wax paper and gently even out the surface.

Use fresh cereal

Cereal that has gone stale from an old open box turns chewy rather than crisp. A newly opened box gives the best crunch.

Salt and vanilla

A small amount of salt and vanilla balances sweetness. Without them, the bars taste flat.

Grease your tools

Melted marshmallow sticks to everything. Spray the spatula and knife with cooking spray, or rub them with butter.

Brown Butter Version

Brown butter is the easiest upgrade. Melt the butter in the pot over medium heat, swirl it as it foams and cook 4 to 6 minutes until the milk solids at the bottom turn golden brown and the butter smells nutty. Pull it from the heat immediately, then add the marshmallows and continue as directed. Use 5 tablespoons of butter to make up for water that cooks off.

Variations

• Chocolate drizzle: Melt 1/2 cup chocolate chips with 1 teaspoon oil and drizzle over the cooled bars.
• Peanut butter: Stir 1/3 cup creamy peanut butter into the melted marshmallows.
• Cocoa: Substitute cocoa-flavored crispy rice cereal for a chocolate version.
• Funfetti: Fold 1/3 cup rainbow sprinkles into the mixture after the cereal.
• S’mores: Replace 2 cups of cereal with graham cereal and fold in 1/2 cup mini chocolate chips after the mixture cools slightly.
• Salted caramel: Drizzle with caramel sauce and finish with flaky salt.
• Fruity: Use fruit-flavored crispy cereal in place of plain.
• Microwave method: Heat butter and marshmallows in a large microwave-safe bowl for 2 minutes, stir, then heat 1 minute more and stir until smooth.

Storage and Make-Ahead

• Room temperature: Store in an airtight container, with wax paper between layers, for up to 3 days.
• Refrigeration: Not recommended, as it hardens the bars.
• Freezing: Wrap individual bars in plastic wrap and freeze in a bag for up to 2 months. Thaw at room temperature for 30 minutes.
• Soften hard bars: Microwave a bar for 5 to 8 seconds.
• Make ahead: Prepare the bars a day before an event and keep them covered at room temperature.

Cutting and Gifting

For clean squares, let the slab set fully, lift it out with the parchment overhang and slice on a cutting board with a lightly oiled chef’s knife. Cut 4 rows by 4 rows for 16 bars, or use cookie cutters to make shapes and press the scraps into a new batch. For gifts or bake sales, wrap each bar in wax paper or cellophane and tie with ribbon. Dipping one end in melted chocolate and rolling it in sprinkles makes them look finished with very little work.

FAQ

Why are my Rice Krispie treats hard?

The most common causes are overheating the marshmallows, using too much cereal, or pressing the mixture too firmly into the pan.

Can I use marshmallow creme?

Yes. Replace the marshmallows with one 7-ounce jar of marshmallow creme and one cup of mini marshmallows. The bars will be soft and sticky.

Can I double the recipe?

You can. Use a very large pot, and press the mixture into a half-sheet pan (13×18-inch). Work quickly, since a bigger batch begins setting while you stir.

Salted or unsalted butter?

Either works. With salted butter, leave out the extra salt.

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