Reese's Peanut Butter Cups Rice Krispie Treats Recipe: Fudgy Crunch and Melty Bliss

This Reese's Peanut Butter Cups Rice Krispie treats recipe transforms a classic snack into a decadent dessert that tastes like a candy bar in every bite. The secret lies in melting Reese's cups into the marshmallow mixture, creating pockets of peanut butter and chocolate that stay gooey even after baking.

I developed this version after years of perfecting the balance between crispy edges and fudgy centers—this isn't your childhood snack, it's a dessert that'll impress at parties.

The process is surprisingly straightforward: melt Reese's cups with marshmallows, mix with crispy cereal, and press into a pan. No fancy equipment needed—just a microwave and a little patience.

The key to success is working quickly while the mixture is still warm, ensuring those peanut butter cups stay perfectly melty when you slice. This recipe makes about 24 treats, perfect for sharing or keeping for yourself (no judgment here).

What you'll end up with is a bar that's crispy on the outside, fudgy in the middle, and packed with the iconic Reese's flavor in every bite.

The contrast of crunchy Rice Krispies with the creamy peanut butter and chocolate is pure magic—it's like biting into a candy bar that's been baked into a treat. These disappear fast, so make a double batch if you can. Let's get baking!

These treats are versatile enough for holiday gatherings, birthday parties, or just satisfying that afternoon sweet tooth. Pair them with vanilla ice cream for the ultimate dessert experience. The recipe delivers restaurant-quality results with minimal effort—proof that sometimes the best desserts come from simple ingredients combined in the right way.

Here's everything you need to make them!

Ingredients for reese's peanut butter cups rice krispie treats

Eight ingredients, 24 decadent treats. This isn't your childhood snack—it's candy bar magic in bar form.

Reese's cups are the star here—Hershey's mini cups melt perfectly, but the full-size bars work if you chop them small. Costco or Walmart usually have the mini cups in bulk, which saves money. The marshmallows? Kraft Jet-Puffed are my go-to—they're fluffy and melt just right. If you're using regular marshmallows, make sure they're fresh (no hard or sticky ones!). The butter matters too—Land O'Lakes unsalted is my secret weapon for that rich, creamy texture. Skip the salted kind, trust me.

No Reese's cups? Peanut butter chips plus chocolate chips can mimic the flavor, but it won't be the same. Short on marshmallows? Mini marshmallows from the baking aisle work perfectly—they melt faster and create a smoother texture. The optional dark chocolate chips and peanuts are game-changers, but if you're keeping it classic, skip 'em. For extra crispiness, butterflake shortening is a must—it gives those bars that perfect crunch. And if you're feeling fancy, dust the top with powdered sugar before slicing. It's worth the extra minute!

These treats stay fresh for 5 days in an airtight container at room temperature, but they taste best the first day. If you make a double batch, freeze half for up to 3 months—just thaw at room temp before slicing. Pro tip: Line your pan with parchment paper for easy slicing. And if anyone asks, these are 'gourmet Rice Krispie treats'—no need to admit they're just a fancy snack. They disappear fast, so make extra!

Step-by-step instructions for Reese's peanut butter cups Rice Krispie treats

Here's how to create the ultimate fusion treat—rich peanut butter cups meet crispy marshmallow perfection.

In a large microwave-safe bowl, combine the 0.5 cup unsalted butter and 0.25 cup butterflake shortening. Microwave in 30-second intervals, stirring between each, until completely melted and smooth. You want the mixture to reach about 160°F—just warm enough to melt the marshmallows completely later. This combination gives you that signature crispy texture while keeping the treats rich and flavorful.

Here's the thing—don't skip the stirring between intervals. The butter can separate if you microwave it all at once, and you'll end up with greasy treats instead of perfectly crispy ones. Once melted, set the bowl aside while you prepare the other ingredients.

Working quickly, dump in the 8 oz mini marshmallows all at once. Stir vigorously with a wooden spoon or silicone spatula until the marshmallows are completely melted and the mixture is smooth. This should take about 2-3 minutes of constant stirring—you'll see the mixture thicken as it cools slightly from the melted butter.

Next, add the 1 tsp vanilla extract and 0.25 tsp salt, stirring until fully combined. The salt enhances all the sweet flavors, while the vanilla adds that warm, homey touch. If you notice any unmelted marshmallow bits after a few minutes, give it another 10-15 seconds in the microwave to fully melt them. The mixture should be glossy and hold its shape when you lift the spoon.

Fold in the 0.5 cup dark chocolate chips and 0.25 cup chopped peanuts using a spatula. The chocolate will melt from the residual heat, creating pockets of rich, melty goodness throughout each treat. The peanuts add that satisfying crunch that makes these treats irresistible. Work quickly but gently to avoid overmixing—you want the chocolate to stay in chunks for that fun surprise in every bite.

Here's where it gets fun—taste a small spoonful. The combination of creamy peanut butter cups, marshmallow sweetness, and chocolate richness should make your taste buds dance. If the mixture seems too thick, you can add 1-2 teaspoons of milk (not listed in ingredients—this is the only exception) to loosen it slightly, but it should be workable as-is.

Now for the star of the show—gently fold in the 6 cups Rice Krispies Cereal using a spatula. Work quickly but carefully to avoid crushing the cereal pieces, which is key for that classic Rice Krispie Treat texture. You want to distribute the cereal evenly throughout the mixture without packing it down too tightly. The cereal should be fully coated in the marshmallow mixture, but you should still see plenty of visible cereal pieces.

This is the moment that matters: don't overmix. Each fold should lift and turn the mixture gently. If you see too many crushed pieces, your treats will be denser. The ideal consistency is like thick, wet sand—moldable but not sticky. Once fully combined, transfer the mixture to a 9x13-inch baking dish lined with parchment paper, pressing it down evenly with a spatula.

Let the treats cool completely at room temperature for 30 minutes, then refrigerate for 1 hour to set. This chilling step is crucial—it helps the treats hold their shape when you cut them. If you skip this, your treats might crumble when you try to slice them. Real talk: patience here pays off with clean, crisp edges.

Once fully set, dust the top with 2 tbsp powdered sugar using a fine-mesh sieve. This adds that classic sweet finish and prevents sticking when you cut. Using a sharp knife, cut the treats into 24 equal squares (about 2x2 inches each). For perfectly clean edges, dip the knife in hot water between cuts—this prevents the treats from sticking to the blade. Serve immediately or store in an airtight container for up to 5 days—though they probably won't last that long!

Essential equipment for reese's peanut butter cups rice krispie treats

Microwave Essentials

A 1200-watt microwave is your best friend here—it melts the Reese's cups and marshmallows evenly without burning. I use my GE 1200W microwave because it handles thick mixtures like this without hot spots.

If your microwave is older, stir every 20 seconds instead of 30 to prevent uneven melting. A microwave-safe glass bowl (like Pyrex) is non-reactive and won’t retain flavors from previous foods. 🔥

Mixing Tools Matter

A wooden spoon or silicone spatula is ideal for stirring the marshmallow mixture—metal can cause uneven heating. I keep a OXO Good Grips silicone spatula in my kitchen for this exact purpose.

For folding in the Rice Krispies, a long-handled spatula (like Bambino) helps prevent overmixing. Avoid plastic utensils—they can melt when touching hot butter.

Pan Prep for Perfect Edges

Line your 9x13-inch baking dish with parchment paper—I use Reynolds Non-Stick Parchment Paper—to prevent sticking and make slicing effortless. If you skip this, the treats might tear when cutting.

For extra insurance, lightly grease the parchment with coconut oil spray before pressing the mixture in. A medium-sized offset spatula (like West Bend) helps create even layers.

Cutting Like a Pro

A sharp chef’s knife (I use Mercer Culinary Genesis) with a serrated edge cuts through these treats cleanly. Dip the blade in hot water between cuts to prevent sticking—this trick comes from my grandma’s baking wisdom.

For perfectly square pieces, use a ruler or template to guide your cuts. A pizza wheel also works if you prefer clean, straight lines without crushing the edges.

Storage Containers

An airtight container (like Rubbermaid Brilliance) keeps treats fresh for 5 days at room temperature. For longer storage, quart-sized freezer bags work best—squeeze out excess air before sealing. I label mine with the date using a Sharpie to track freshness.

If storing in the fridge, place a paper towel on top to absorb any moisture that might make the treats soggy. 💡

Frequently asked questions