Family Size Rice Krispies Treats Recipe: Chewy Marshmallow Squares for a Crowd

This recipe delivers perfectly chewy, gooey treats scaled for gatherings. The secret is using a full pound of marshmallows to bind a generous amount of cereal.

You’ll end up with thick, rich squares that hold their shape while staying soft. Ideal for parties, school events, or family movie nights.

Ingredients for Family Size Rice Krispies Treats

Seven simple ingredients create thick, chewy squares perfect for feeding a crowd.

The marshmallows are non-negotiable here. Kraft Jet-Puffed are the gold standard—consistent melt and perfect chew. Most grocery stores carry them in the baking aisle. For the cereal, Kellogg’s Rice Krispies gives that classic snap and pop. Avoid generic brands if possible; they can be stale or less crispy. The butter should be unsalted to control the salt level.

No corn syrup? Skip it—these will still be great. Honey or maple syrup at half the amount can sub in a pinch (but texture changes slightly). Out of vanilla? Almond extract at one-quarter the amount works, though flavor shifts. For a fun twist, add 1 cup mini chocolate chips or sprinkles after mixing. Just fold them in gently so they don’t all sink to the bottom.

Store in an airtight container at room temperature for up to 3 days. They’ll stay fresh longer in the fridge for 1 week, but bring to room temp before serving. Freeze for 6 weeks wrapped tightly—thaw overnight before cutting.

Step-by-Step Instructions for Family Size Rice Krispies Treats

This method ensures perfectly chewy, gooey squares that hold their shape when cut.

Step 1: Prepare the Pan and Measure Ingredients

Begin by thoroughly coating a 9×13-inch baking pan with the cooking spray, including the sides and corners. I use a paper towel to spread it evenly for complete coverage. This prevents sticking and makes cleanup effortless.

Measure out all your ingredients before starting: 12 cups Rice Krispies Cereal, 1 lb Marshmallows, 0.5 cup Unsalted Butter, 2 tsp Vanilla Extract, 0.5 tsp Salt, and 0.25 cup Light Corn Syrup. Having everything ready ensures a smooth process without frantic searching mid-recipe.

Step 2: Melt the Butter and Marshmallow Mixture

In a large, heavy-bottomed pot, melt the 0.5 cup Unsalted Butter over low heat. Once melted, add the 1 lb Marshmallows and stir constantly with a silicone spatula or wooden spoon. The marshmallows will begin to soften and collapse after 2-3 minutes.

When about half the marshmallows have melted, add the 0.25 cup Light Corn Syrup, 2 tsp Vanilla Extract, and 0.5 tsp Salt. Continue stirring until the mixture is completely smooth with no visible marshmallow lumps. This should take 5-7 minutes total. Remove from heat immediately once smooth to prevent scorching.

Step 3: Incorporate the Rice Krispies Cereal

Working quickly before the mixture sets, add all 12 cups Rice Krispies Cereal to the pot. Using the same spatula, fold the cereal into the marshmallow mixture with a gentle pressing motion. The goal is to coat every piece evenly without crushing the cereal.

You’ll notice the mixture becomes thick and slightly glossy as the cereal absorbs the marshmallow coating. Stop folding once all the cereal is incorporated and no dry pieces remain visible. The entire process should take 1-2 minutes—any longer and the mixture may begin to harden in the pot.

Step 4: Press and Shape in the Prepared Pan

Transfer the mixture to your prepared 9×13-inch pan. Using your spatula or the back of a large spoon, press the mixture evenly into all corners and edges. For the smoothest top, I like to lightly coat my hands with additional cooking spray and press down firmly with my palms.

The mixture should fill the pan completely with a uniform thickness of about 1.5 inches. Press down until the surface looks compressed and even. Avoid over-handling, as this can make the treats too dense. Let the pan sit undisturbed for 5 minutes to begin setting.

Step 5: Cool Completely Before Cutting

Allow the treats to cool at room temperature for at least 1 hour before cutting. This cooling time is crucial—cutting too soon will result in messy, misshapen squares. The surface should feel firm to the touch and the edges should have pulled slightly away from the pan.

Once fully set, use a sharp knife coated with a bit of cooking spray to cut into 20 equal squares. Wipe the knife between cuts for clean edges. Store the treats in an airtight container at room temperature for up to 3 days, though they’re best enjoyed fresh.

Dietary Considerations for This Dish

Gluten-Free Option

Use Kellogg’s gluten-free Rice Krispies—they’re clearly labeled and taste identical to the original. The texture and snap remain perfect, and you won’t notice any difference in the final result. Just verify the label to ensure no cross-contamination.

Vegan Adaptation

Swap in Dandies vegan marshmallows and Earth Balance plant-based butter. Both melt beautifully and maintain that classic gooey texture. I’ve tested this version many times—it’s just as chewy and delicious as the original. 🌱

Skip the vanilla extract if it’s not alcohol-free, as some brands contain trace amounts.

Dairy-Free Considerations

Use Miyoko’s or Country Crock plant butter instead of dairy butter. The flavor difference is minimal, and the binding power remains the same. Ensure your marshmallows are also dairy-free—most standard brands already are.

Low-Sugar Version

Replace half the marshmallows with sugar-free Jet-Puffed to cut sugar content significantly. The texture stays soft, though slightly less sticky. Add 1 extra tbsp of corn syrup to help with binding.

Nut-Free Note

This recipe is naturally nut-free, but always check your cereal and marshmallow labels. Some facilities process nuts, so look for “nut-free facility” labels if allergies are severe. 💡

Frequently Asked Questions