I’ll never forget the first time I whipped up a batch of Cheerio Cereal Bars—it felt like magic in my kitchen. With just four simple ingredients, these no-bake treats bring together the creamy embrace of peanut butter and the sweetness of marshmallows, making for a delightful snack that even the pickiest eaters will adore. Not only are they incredibly quick to prepare, taking only ten minutes from start to finish, but they’re also customizable—add M&Ms or any of your favorite mix-ins for a fun twist! Whether you’re looking for a breakfast on-the-go, a post-school treat, or just something to satisfy that afternoon craving, these chewy, crunchy bars will quickly become a staple in your home. Ready to dive into a delicious recipe that’s as easy as it is tasty?

Why are Cheerio Cereal Bars a must-try?
Simplicity makes these bars a superstar! With just four ingredients, even novice chefs will enjoy making them. Customizable for anyone—swap in M&Ms, dried fruits, or nuts to suit taste preferences! *Quick preparation means you can enjoy homemade goodness in just ten minutes. *Perfect for all* ages, they’re ideal as breakfast, snacks, or shared treats at gatherings. Plus, nutrient-packed with peanut butter, these Cheerio Cereal Bars offer a delightful balance of flavor and texture. Try pairing them with a refreshing smoothie for a satisfying snack combo!
Cheerio Cereal Bars Ingredients
For the Bars
- Mini Marshmallows – These provide sweetness and binding; substitute with regular marshmallows if mini are unavailable.
- Butter – Adds richness and helps melt the marshmallows; can substitute with margarine for a dairy-free option.
- Peanut Butter – Adds protein and flavor; use almond or sunflower seed butter for a nut-free version.
- Cheerios – Serves as the base for texture and crunch; consider honey nut Cheerios for a different taste.
Optional Mix-ins
- M&Ms – Add these for a fun, chocolatey surprise! Mix in before the marshmallows begin to set for better distribution.
Step‑by‑Step Instructions for Cheerio Cereal Bars
Step 1: Melt Ingredients
In a microwave-safe bowl, combine 1 cup of butter and 4 cups of mini marshmallows. Heat in the microwave for about 1 minute on high or until the marshmallows puff up and become soft. Carefully remove the bowl and stir until the mixture is smooth and fully melted, creating a creamy base for your Cheerio Cereal Bars.
Step 2: Add Peanut Butter
Quickly add 1 cup of peanut butter to the melted marshmallow mixture. Stir vigorously until the peanut butter is thoroughly incorporated and the mixture is smooth. The warmth from the marshmallows will help blend everything together seamlessly. Once combined, you’ll have a rich, gooey mixture ready for the next step.
Step 3: Mix Cheerios
Now, it’s time to add the heart of your Cheerio Cereal Bars! Fold in 6 cups of Cheerios and mix until they’re evenly coated with the peanut butter and marshmallow mixture. This step ensures that every bite is delicious and chewy. Make sure to do this quickly while the mixture is still warm, allowing for better adhesion.
Step 4: Press into Pan
Prepare a greased 9×13-inch baking dish for your mixture. Using clean, wet hands, press the Cheerio mixture firmly and evenly into the dish. The dampness of your hands will prevent sticking, making this process smoother. Aim for a compact, even layer to help the bars hold their shape once they set.
Step 5: Set & Cut
Allow the Cheerio Cereal Bars to set at room temperature for about 20 to 30 minutes until firm. Once set, remove the mixture from the dish and place it on a cutting board. Use a sharp knife or a board scraper to slice into squares or bars as per your preference. These delightful snacks are now ready to be enjoyed!

Cheerio Cereal Bars Variations & Substitutions
Feel free to let your creativity shine by customizing your Cheerio Cereal Bars in exciting ways!
- Dairy-Free: Substitute butter with coconut oil or vegan margarine for a deliciously creamy, dairy-free option. You won’t even miss the butter!
- Nut-Free: Swap peanut butter for sunbutter or tahini to cater to nut allergies, still packing a protein punch with a unique flavor twist.
- Sweet & Salty: Add a sprinkle of sea salt atop the bars before they set for a delightful contrast to the sweet marshmallows. It brings out the flavors beautifully!
- Fruit & Nut Medley: Mix in 1/2 cup of dried cranberries, raisins, or chopped nuts for an added texture and burst of flavor. Nuts add a satisfying crunch!
- Chocolate Lovers: Incorporate mini chocolate chips alongside or instead of M&Ms for a different chocolatey goodness. They’ll melt slightly and create a luscious treat!
- Granola Boost: For an extra health kick, substitute a portion of the Cheerios with quick oats or granola for a fiber-rich snack. Your bars will have a heartier bite!
- Flavor Fun: Try using flavored peanut butter, such as chocolate, vanilla, or even cinnamon for added depth. This twist makes the bars uniquely delicious.
- Coconut Flakes: Stir in shredded coconut for a tropical touch. It complements the marshmallows wonderfully, adding a chewy texture that’s simply delightful!
Feel inspired? These variations can transform your Cheerio Cereal Bars into a delightful array of nourishing snacks. Plus, while you’re exploring, why not also try making Butter Cheerio Bars or Frosted Zucchini Spice Bars? Your taste buds will thank you!
Make Ahead Options
These Cheerio Cereal Bars are perfect for meal prep enthusiasts looking to save time during busy weeks! You can prepare the mixture up to 24 hours in advance by melting the butter and mini marshmallows, then combining with peanut butter and Cheerios. Once mixed, press the mixture into the baking dish, cover it well, and refrigerate until ready to cut into bars. By setting the bars in the fridge, they’ll maintain their chewiness without becoming too soft. When you’re ready to serve, simply cut them into squares after letting them sit at room temperature for a few minutes to soften slightly—enjoy these delightful snacks just as delicious as if made fresh!
What to Serve with Cheerio Cereal Bars?
Indulging in the deliciousness of these chewy treats opens up a world of delightful meal options to enhance your snacking experience.
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Fresh Fruit Salad: Bursting with color and flavor, a mix of berries, apples, and bananas adds a refreshing crunch that balances the chewy bars beautifully.
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Yogurt Parfait: Layer creamy yogurt with granola and honey for a wholesome treat. The smoothness complements the texture of the Cheerio Cereal Bars wonderfully.
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Nut Butter Dip: Serve the bars with a side of almond or cashew butter for an extra protein boost. It creates a delightful flavor contrast that’s nutty and satisfying.
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Chocolate Milkshake: A rich, creamy shake provides a sweet and indulgent pairing. The chocolate flavors enhance the sweetness of the bars, making for a snack that feels like dessert.
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Energy Smoothie: Blend spinach, banana, and almond milk for a nutrient-packed drink. This vibrant, green smoothie adds a refreshing touch to your snack.
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Iced Green Tea: Refreshing and subtly sweet, iced green tea offers a light companionship to the sweetness found in the bars without overwhelming your palate.
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Cheese Platter: Pairing with sharp cheese and whole-grain crackers creates a perfect savory contrast to the sweetness of the bars, pleasing a variety of taste buds.
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Cinnamon Applesauce: A warm side of cinnamon-spiced applesauce adds comforting warmth that complements the crunchy, chewy texture of each bite.
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Dark Chocolate Squares: For an indulgent finish, serve a few squares of dark chocolate on the side. The rich bitterness of the chocolate beautifully pairs with the sweet bars.
Each pairing enhances the experience, transforming your Cheerio Cereal Bars into a memorable part of a delightful snack time or meal!
Expert Tips for Cheerio Cereal Bars
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Sticky Hands Solution: Use wet hands to press the mixture into the pan. This prevents the sticky mixture from clinging to your fingers, making it easier to handle.
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Mix-in Timing: Add M&Ms or other candies while the marshmallows are still warm. This ensures they stick well and are evenly distributed throughout your Cheerio Cereal Bars.
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Uniform Mixing: Stir the Cheerios quickly after adding them to the melted mixture. Doing it while warm helps to coat each piece thoroughly, ensuring each bite is deliciously flavorful.
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Cutting Technique: Instead of using a knife, a board scraper works wonders for cutting the bars cleanly. It provides more control, leading to perfectly shaped pieces.
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Storage Tips: Keep your Cheerio Cereal Bars in an airtight container at room temperature. They stay fresh for up to a week, making them a great make-ahead snack!
How to Store and Freeze Cheerio Cereal Bars
Room Temperature: Keep your Cheerio Cereal Bars in an airtight container at room temperature for up to one week to maintain their chewy and crunchy texture.
Fridge: For extended freshness, store the bars in the refrigerator. They can last up to two weeks when properly sealed, which also enhances their flavor!
Freezer: To save for later, you can freeze them! Wrap each bar tightly in plastic wrap and place them in a freezer-safe bag. They’ll stay fresh for up to three months.
Reheating: When ready to enjoy, thaw at room temperature for a quick snack, or pop them in the microwave for 10-15 seconds for a warm treat!

Cheerio Cereal Bars Recipe FAQs
How do I choose the best marshmallows for these bars?
When selecting your marshmallows, mini marshmallows work best because they melt quickly and evenly. If you only have regular marshmallows, you can absolutely use them; just cut them into smaller pieces to ensure they melt seamlessly into the mixture. Keep an eye out for any marshmallows that have hardened or have dark spots, as these are signs they may not have the best texture for your Cheerio Cereal Bars.
How should I store the Cheerio Cereal Bars?
For optimal freshness, keep your Cheerio Cereal Bars in an airtight container at room temperature for up to one week. If you want them to last longer, store them in the refrigerator; they will remain delicious for up to two weeks when properly sealed. Alternatively, place them in the freezer, individually wrapped in plastic wrap and stored in a freezer bag, for up to three months! Remember to thaw at room temperature or pop them in the microwave for a quick warm-up.
Can I freeze Cheerio Cereal Bars?
Absolutely! To freeze your Cheerio Cereal Bars, first let them cool completely. Then wrap each bar tightly in plastic wrap to prevent freezer burn. Place them in a freezer-safe container or bag, and they will stay fresh for up to three months. When you’re ready to eat, just take out a bar and let it thaw at room temperature or warm it up in the microwave for 10–15 seconds for a chewy treat!
What can I do if my bars are too sticky to cut?
No worries! If your Cheerio Cereal Bars are a bit sticky and difficult to cut, try chilling them in the refrigerator for about 20 minutes. This will firm them up, making them easier to slice without sticking to your knife. Additionally, using a board scraper can help you get cleaner cuts. Just press down gently to slice through the bars without tearing them apart.
Are there any allergens I should be aware of with this recipe?
Yes, it’s always good to be cautious! The main allergens in Cheerio Cereal Bars come from peanut butter and butter, which contain nuts and dairy, respectively. If you’re making these bars for someone with allergies, consider substituting peanut butter with almond or sunflower seed butter for nut-free versions. You can also use dairy-free margarine in place of butter for a dairy-free variation. Always double-check any packaged ingredients like Cheerios, as they may contain possible allergens.
Can pets eat Cheerio Cereal Bars?
While Cheerios themselves are safe for dogs in moderation, these bars aren’t ideal for pets due to the sugar content from marshmallows and peanut butter. Always ensure to keep them away from your furry friends and stick to designated pet snacks instead!

Cheerio Cereal Bars: Easy No-Bake Snack for All Ages
Ingredients
Equipment
Method
- In a microwave-safe bowl, combine 1 cup of butter and 4 cups of mini marshmallows. Heat in the microwave for about 1 minute on high or until the marshmallows puff up and become soft. Carefully stir until the mixture is smooth and fully melted.
- Quickly add 1 cup of peanut butter to the melted marshmallow mixture. Stir vigorously until thoroughly incorporated.
- Fold in 6 cups of Cheerios until evenly coated.
- Prepare a greased 9x13-inch baking dish. Using wet hands, press the mixture firmly and evenly into the dish.
- Allow the bars to set at room temperature for about 20 to 30 minutes until firm. Cut into squares or bars.

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