No bake monster cookie bars made with rich peanut butter, chewy oats, and delicious peanut butter are the perfect dessert treat!
These monster cookie no bake bars are so fun and delicious (and super easy to make!). Enjoy them with other cookie faves like chocolate chip crockpot cookie, red velvet cookies, and pie crust cookies.
No Bake Monster Cookie Bars
No Bake Monster Cookie Bars
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Why you’ll love this easy dessert bar recipe!
📌 Rich and full of delicious peanut butter and chocolate flavor.
📌 Easy to make for holidays and bake sales.
📌 No need to turn on the oven!
Monster Cookie No Bake Bar Ingredients
- Butter – Salted butter, softened to room temperature.
- Sugars – White granulated sugar and brown sugar.
- Peanut butter – Creamy peanut butter (or other nut or sun butter if substituting).
- Vanilla – Real vanilla extract.
- Flour – All purpose flour.
- Oats – Quick oats.
- M&M’s – Classic M&M’s.
- Topping – Heavy cream, semisweet chocolate chips, mini M&M’s or sprinkles.
Butter, sugars, oats, chocolate, peanut butter, flour, M&M’s, vanilla., heavy cream.
How do you make no bake peanut butter oatmeal monster cookie bars? (step-by-step directions)
⭐ First, heat treat the flour by placing it in a microwave safe bowl, and microwaving in short increment until the flour reaches a safe temperature. Allow to cool.
⭐ Next, using an electric mixer, cream together the butter, sugar and brown sugar. Add in the peanut butter and vanilla and mix until smooth. Mix in the flour, then stir in the oats and the M&Ms. Press the dough into a lined 2 quart baking dish.
⭐ Then, pour the heavy cream into a microwave safe bowl with the chocolate chips, and microwave in 30 second intervals, whisking each time, until the chocolate chips have melted and the mixture is smooth and shiny.
⭐ Finally, spread the chocolate ganache over the prepared cookie dough and spread to the edges. If desired, sprinkle the mini M&M’s over the top of the chocolate. Chill until set.
Mix together the bar ingredients with an electric or stand mixer, then press into a parchment lined pan.
Preparation
How do you make raw flour safe to eat?
Make sure you heat it in the oven or microwave until it reaches a temperature of 165F. This is the temperature that will kill dangerous bacteria and make the flour safe to eat.
What can I use instead of peanut butter?
You can substitute other nut butters such as almond butter or cashew butter. If you need to avoid nuts altogether, try a seed butter like sun butter.
Whisk together the heated cream and chocolate to make ganache, then pour over the bars. Top with mini M&M’s.
Storage and leftovers
How long do no bake monster cookie bars last?
These will keep at room temperature for 3 – 4 days or as long as a week in the refrigerator. Make sure to store in an air tight container.
Can you freeze monster cookie no bake bars?
Yes, these will keep in the freezer for 3 – 4 months. If slicing before freezing, layer with parchment paper so they don’t stick together.
Thaw overnight in the refrigerator for best results.
Allow to set in the refrigerator, then cut into squares.
Tips, tricks, and frequently asked questions
✅ Decorate with specific M&M colors to celebrate holidays and special events.
✅ Swap out the peanut butter for other nut butters or sun butter if you can’t use peanut butter.
✅ Add other fun mix-ins like dried coconut flakes, chopped nuts, or toffee bits.
These are rich, decadent, and downright addicting.
What to eat with no bake monster cookie bars (serving suggestions)
Enjoy these after a yummy dinner of tuna casserole or white chicken enchiladas. On the side try our instant pot rice or a colorful bowl of fruit salad!
You can use old fashioned oats, but they will have a little more bite to them than if you use quick cooking.
More delicious monster recipes
You can switch things up and try topping these with butterscotch ganache!
Other dessert bar recipes you’ll love
- Rice krispies treats
- Lime bar recipe
- Scotcharoos
- Magic cookie bars
- Sugar cookie bars
- Best lemon bars
- See all our dessert bar recipes!
More no bake desserts to try!
- Strawberry jello pie
- Buckeye balls
- S’mores bark
- Peanut butter pie
- Oreo truffles
- See all our no bake dessert recipes!
What other mix-ins will you use?
Tools we love
- Ceramic bakeware set – This baking dish set is gorgeous and has all the size casserole dishes you’ll ever need!
- Large spatula – No one wants a small portion!
😍😍😍
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How to Make No Bake Monster Cookie Bars
No Bake Monster Cookie Bars
Ingredients
- ½ cup salted butter softened to room temperature
- ½ cup white granulated sugar
- ¼ cup brown sugar
- 1 cup creamy peanut butter
- 1 teaspoon real vanilla extract
- ½ cup all purpose flour
- 2 cups quick cooking oats
- 1 cup M&Ms
TOPPING:
- 1¼ cup semi-sweet chocolate chips
- ½ cup heavy cream
- ¼ cup mini M&Ms optional
Instructions
- Heat treat the flour by placing it in a microwave safe bowl, and microwaving in 30 second increments, stirring each time, until the temperature reaches a temperature of 165 degrees (about 2 minutes total). Allow to cool.
- Using an electric mixer, or a stand mixer with the paddle attachment, cream together the butter, sugar and brown sugar. Add in the peanut butter and vanilla and mix until smooth.
- Mix in the flour, then stir in the oats and the M&Ms. Press the dough into a parchment lined 2 quart baking dish.
- Pour the heavy cream into a microwave safe bowl with the chocolate chips, and microwave in 30 second intervals, whisking each time, until the chocolate chips have melted and the mixture is smooth and shiny.
- Pour the chocolate ganache over the prepared cookie dough and spread to the edges. If desired, sprinkle the mini M&M's over the top of the chocolate.
- Chill for 1 to 2 hours until set.
Notes
Nutrition
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No Bake Monster Cookie Bars
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Abeer says
These were so indulgent and they disappeared so quickly at my last party! Everyone loved them.
Kristyn says
Whenever I have to bring a dessert somewhere, I bring these!! Everyone loves them!! They are creamy, with that candy crunch & so good!
Abby says
Loved everything about these! They turned out amazing and my kids devoured them.