Halloween Rice Krispies Treats – Monster Crunch Bars!

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Make a batch of Monster Crunch Bars (Halloween Rice Krispies Treats) to satisfy the little monsters in your home this Halloween! Regular Rice Krispie treats get a monstrous makeover, combining sweet and salty flavors in one delicious snack.

Pretzels, peanuts, choc chips, candy corn and more all go into these bars, and some monsters even get trapped in the process – you can see their eyeballs pushing through the chocolate layer trying to escape!

Halloween Rice Krispies Treats - Monster Crunch Bars

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Halloween Rice Krispies Treats

I just LOVE these Monster Crunch Bars – they not only look awesome but they taste so good too! They have that sweet-salty combo going on that so many people love, and they’re actually a great way to use up leftover candy too.

The bars are made in several layers, and all the cooking (well, melting) is done in the microwave. There is a layer of Rice Krispies (or other generic puffed rice cereal) mixed with pretzels on the bottom, a peanut butter layer next, followed by a layer of melted chocolate at the very top, which is covered with peanuts, pretzels, candy corn, and Reese’s Pieces. Oh, and candy eyes too in various sizes! To me, it looks like the monsters are peeking up from inside the dessert itself!

Monster Crunch Bar Ingredients
Monster Crunch Bar Ingredients

Ingredients used in this recipe

The full ingredients list and instructions are found in the printable recipe card at the end of this post, but here is a brief outline so you know what to expect from the recipe. I highly recommend always reading a recipe all the way through before starting.

Equipment used in this recipe

You are likely to have many of these cooking tools in your kitchen already, but I’ve added some Amazon links for your convenience should you need to purchase anything for this recipe.

A fun halloween snack - Halloween Rice Krispies Treats - Monster Crunch Bars (step-by-step images)

How to make Monster Crunch Bars

You can save the Monster Crunch Bars recipe video to your YouTube Playlists for future reference. (Don’t forget to subscribe while you are there!)

These Halloween Rice Krispies Treats would be a great recipe for kids to make as it is so ridiculously easy to do. Depending on their age and kitchen experience, they will need help with the microwave and handling of hot liquids. So this might be something that you do for them. But adding the monster toppings is definitely a job for them!

The snack is so easy that even if you don’t have a cooking bone in your body, you can make this – I promise!

Grab yourself a 9×13 baking dish and a few microwave-safe bowls and lets get cookin’!

Rice Krispies & Pretzel Layer
Rice Krispies & Pretzel Layer

Starting with the Rice Krispies & pretzel layer which is made by melting butter and marshmallows and then stirring in the cereal and chopped pretzels. This mixture is pressed into the bottom of the dish and left to set in the fridge while you prepare the next layer.

Don’t worry about it setting completely as we’ll be leaving the completed dish for a few hours before cutting into bars.

Peanut Butter Layer
Peanut Butter Layer

For the peanut butter layer you will melt butter, corn syrup, and peanut butter chips and then stir in chopped peanuts. This is spread onto the cereal layer and popped back in the fridge while you do the next layer!

The final “cooked” layer is made by melted butter, corn syrup, and chocolate chips together, and then poured over the peanut butter layer. I think you’ll agree that so far, so easy?!

Chocolate Layer
Chocolate Layer

Now the best part – adding the monster crunch topping! While the chocolate is still warm, press in candy eyes (I know they’re missing from the photo below) – use assorted sizes as they add a real fun element to this Halloween dessert. Then add the rest of the topping ingredients – pretzels, chopped peanuts, candy corn, and Reese’s Pieces – or any candy you like really!

Place the dish into the refrigerator and leave to set for a few hours before cutting into bars – enjoy!

Monster Crunch Topping
Monster Crunch Bars (Halloween Rice Krispies Treats)

Make It A Meal!

You’ve made the dessert, but what about the rest of the courses? Here are some recipes to take a look at to make a complete meal!

There are 500+ Recipes on The Purple Pumpkin Blog for you to enjoy! Please feel free to check them out too.

awesome for Halloween - monster crunch bars

More Recipes Using Candy

More Halloween Recipes

Once you’ve made these awesome Halloween Rice Krispies Treats I know you’ll be looking for more Halloween recipes – here are some for you to take a look at:

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close up of monster crunch bars (Halloween Rice Krispies Treats)
Monster Crunch Bars

Monster Crunch Bars

Yield: 24
Prep Time: 30 minutes
Additional Time: 2 hours
Total Time: 2 hours 30 minutes

Fun to make, and fun to eat, these Monster Crunch Bars are a delicious sweet and salty snack for Halloween!


For the Rice Krispies Layer

  • 6 Tbsp butter
  • 1 (10.5 oz/300 g) package mini marshmallows
  • 3 cups Rice Krispies (or generic puffed rice cereal)
  • 2⅔ cups mini pretzels, coarsely chopped

For the Peanut Butter Layer

  • 2 Tbsp butter
  • ¼ cup light corn syrup*
  • ¼ cup peanut butter chips

For the Chocolate Layer

  • 2 Tbsp butter
  • ¼ cup light corn syrup
  • 1 cup chocolate chips

For the Monster Crunch Topping

  • ¼ cup salted peanuts, coarsely chopped
  • ½ cup Reeses Pieces candy
  • ¼ cup candy corn
  • ⅓ cup miniature pretzels
  • Candy eyes in assorted sizes


  1. Grease a 9" x 13" baking dish with non-stick cooking spray.
  2. For the Rice Krispies layer: In a large microwave-safe bowl, microwave 6 tablespoons of butter until melted.
  3. Add the marshmallows to the bowl of melted butter and return to the microwave for 1 to 2 minutes or until marshmallows are melted, stirring in 30-second intervals.
  4. Add Rice Krispies and pretzels. Stir to combine and immediately press into the prepared baking dish. Use wax paper to press down as the mixture will be very sticky. Place dish in the fridge while you prepare the next layer.
  5. For the peanut butter layer: Combine the butter and corn syrup in a microwave-safe bowl. Heat in the microwave for 45-60 seconds or until the butter is melted, stirring halfway.
  6. Add the peanut butter chips and stir well. Return to microwave and cook for another 30-40 seconds or until the chips are melted, stirring halfway. Spread the peanut butter mixture over the cereal layer. And place in the fridge while you prepare the chocolate layer.
  7. For the chocolate layer: Place the butter and corn syrup in a microwave-safe bowl and heat for 45-60 seconds, or until the butter is melted, stirring halfway. Add the chocolate chips to the bowl and stir. Return to microwave and cook for a further 30-40 seconds, until the choc chips are melted, stirring halfway through. Spread the chocolate over the peanut butter layer.
  8. For the Monster Crunch topping: While the chocolate is still warm, arrange the candy eyes over the top, along with all the other topping ingredients. Press down gently so that everything sticks to the chocolate.
  9. Return to the fridge to set completely.
  10. Cut into bars and serve.
  11. Store in an airtight container for up to one week.

Recipe card with step-by-step process photos for Monster Crunch Bars


*can substitute for Golden Syrup in the UK.

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Nutrition Information:
Yield: 24 Serving Size: 1
Amount Per Serving: Calories: 219Total Fat: 10gSaturated Fat: 5gTrans Fat: 0gUnsaturated Fat: 3gCholesterol: 13mgSodium: 167mgCarbohydrates: 34gNet Carbohydrates: 0gFiber: 1gSugar: 22gSugar Alcohols: 0gProtein: 3g

This site uses an outside source (Nutritionix) to provide estimated nutrition. If you need exact calories and macros, please do your own calculations.

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The post is part of the Crafty October series on The Purple Pumpkin Blog is filled with free printables, crafts, recipes, and more for Halloween! You can check out Crafty October from 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, and 2012 for tons of awesome Halloween ideas and inspiration!

Crafty October on The Purple Pumpkin Blog

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