Pumpkin Pie Rice Krispie Treats with Graham Cracker Crumbs

When the marshmallow mixture hits the cereal, it needs to be loose enough to fold through every bit before it starts setting. Pumpkin adds moisture, though, and that can leave…

By Julia • October 18, 2026 • Reading time: 8 min

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Tip: save now, cook later.

Serves 4–6

When the marshmallow mixture hits the cereal, it needs to be loose enough to fold through every bit before it starts setting. Pumpkin adds moisture, though, and that can leave cereal treats soft and sticky if it goes straight into the pan without cooking down first. I reduce the puree before adding anything else, and these Pumpkin Pie Rice Krispie Treats with Graham Cracker Crumbs set up into neat squares with a gentle pumpkin flavor.

The graham cracker crumbs give each bite a little of that pie-crust feel, while pumpkin pie spice brings warmth without making the treats taste like a slice of pie. Keep the marshmallows over low heat and stop as soon as they’re smooth; cooking them longer makes the mixture harder to fold and the finished treats denser. The result is a chewy, crisp-edged square with pumpkin and graham in every bite.

Pumpkin Pie Rice Krispie Treats with Graham Cracker Crumbs, chewy spiced squares

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Kitchen Note

Combine the cereal and graham crumbs before you start melting the marshmallows. Once the pot comes off the heat, the mixture is easiest to fold while it’s still warm and loose.

Save these pumpkin pie Rice Krispie treats for a chewy, graham-cracker-crusted twist on the classic cereal square.

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Why the Pumpkin Has to Cook Down Before the Marshmallows Go In

Pumpkin puree brings more moisture to this mixture than butter or vanilla does. If it goes straight into the marshmallows, that extra water can make the treats too soft to cut cleanly and can leave them tacky after they’ve set. Cooking the puree on its own gives that moisture time to evaporate before the marshmallows are added.

Watch the puree as it cooks: it should become thicker and reduce from its starting amount to about half. Stir often so it doesn’t catch on the bottom of the saucepan. This step changes the texture more than the pumpkin flavor; the finished treats still taste gently spiced, rather than strongly pumpkin-heavy. Once the puree has thickened, keep the remaining cooking gentle. The marshmallow mixture only needs to melt smooth, not bubble or brown.

What the Pumpkin and Graham Crumbs Bring to These Cereal Treats

Canned pumpkin puree — Use plain puree, not pumpkin pie filling, which is already sweetened and spiced. Canned puree gives a consistent starting point; fresh pumpkin varies in moisture and can make the reduction less predictable.
Unsalted butter — It loosens the marshmallows and adds a mellow richness. Unsalted butter lets the fine salt stay in balance; if you only have salted butter, leave out the added salt.
Miniature marshmallows — Their small size helps them melt evenly over low heat. A fresh package melts more smoothly than marshmallows that have dried out and become firm.
Crisp rice cereal — Fresh cereal keeps the squares light and crisp. A store-brand crisp rice cereal works just as well as a name brand as long as it hasn’t gone stale.
Graham cracker crumbs — These bring the familiar toasted-cookie note that makes the treats feel pie-inspired. Fine, even crumbs coat the cereal more evenly than large pieces.
Pumpkin pie spice and vanilla extract — The spice provides the recognizable warm flavor, and vanilla rounds out the melted marshmallows. Use a spice blend that still smells fragrant; there’s no need to buy an expensive vanilla for this mixture.

How to Melt, Fold, and Set the Mixture Without Compacting It

Line the pan and ready the cereal

Line a 9×13-inch baking pan with parchment, leaving enough overhang to lift the slab out later. Coat the parchment lightly with cooking spray so the sticky mixture releases cleanly. Combine the crisp rice cereal and graham cracker crumbs in a large bowl before turning to the saucepan. Having the pan prepared also keeps you from rushing when the marshmallows are ready.

Reduce the pumpkin until thick

Cook the puree in a 4-quart saucepan over medium-low heat, stirring often for 5 to 7 minutes. It should look thicker and reduced to about 1/4 cup, not watery or spread thin across the pan. Stir along the bottom and sides so the puree heats evenly and doesn’t scorch. If it still looks loose, keep cooking and stirring until it reaches that thicker consistency.

Melt the spiced marshmallow base gently

Add the butter, pumpkin pie spice, and salt, then stir over low heat until the butter melts, about 1 minute. Add the miniature marshmallows and keep stirring over low heat for 3 to 4 minutes, until the mixture is smooth. If you turn the heat up to hurry it along, the marshmallows can overheat and become stiff before they coat the cereal. Take the pan off the heat and stir in the vanilla.

Fold, press lightly, and let the slab set

Pour the warm marshmallow mixture over the cereal and crumbs, then fold until everything is evenly coated. Transfer it to the prepared pan and use a lightly greased spatula to press it into an even layer. Press gently; packing the mixture down hard makes dense, firm squares instead of chewy ones. Leave the pan at room temperature for about 1 hour, until the slab feels firm enough to lift and cut into 16 squares.

Two Easy Ways to Change the Spice or Make Them Gluten-Free

Use cinnamon for a simpler spice note

Replace the pumpkin pie spice with the same amount of ground cinnamon. The treats will taste more directly cinnamon-forward and less like a mixed baking spice, while keeping the pumpkin and graham flavors intact.

Make a gluten-free batch

Use gluten-free crisp rice cereal and gluten-free graham cracker crumbs in place of the standard versions, choosing marshmallows labeled gluten-free as well. The texture stays close to the original, though the crumbs may have a slightly different flavor depending on the brand.

Storage and Reheating

Refrigerator: Store the squares in an airtight container for up to 4 days. They’ll firm up in the fridge, so let them sit at room temperature before serving.
Freezer: Wrap individual squares and freeze them in an airtight container for up to 1 month. Thaw them while wrapped at room temperature to limit condensation on the cereal.
Reheating: These don’t need reheating. Microwaving can make the marshmallow coating hot and sticky; let chilled squares soften at room temperature instead.

Questions That Come Up While Making Pumpkin Pie Rice Krispie Treats

Can I use regular-sized marshmallows instead of miniature ones?+

Yes, use the same package weight. Larger marshmallows may take longer to melt, so keep the burner low and stir until no lumps remain before adding the vanilla.

Can I use foil instead of parchment in the pan?+

Yes. Leave an overhang so you can lift out the slab, and coat the foil lightly with cooking spray; parchment usually releases a little more easily from sticky marshmallow.

Can I double the batch in the same saucepan and bowl?+

I’d make two batches instead. A double batch is difficult to stir evenly in the saucepan and to fold through the cereal without spilling, and the mixture can start setting before it’s fully coated.

How do I clean the saucepan after the marshmallow mixture sticks?+

Fill the saucepan with warm water and let it soak until the marshmallow residue softens. It will lift more easily after soaking than if you try to scrape it while it’s hardened.