Peanut Butter Cookie Bars (5 Ingredients!) Recipe - Rachel Cooks® (2024)

Irresistible peanut butter cookie bars with only 5 ingredients! Kid-friendly, easy to make and so delicious, this bar recipe is dangerous!

Easy to make Peanut Butter Bars

Only 5 ingredients! I’m not even kidding. There are FIVE ingredients in these M&M peanut butter bars! Here’s an easy math lesson:

1 + 1 + 1 + 1 + 1 + oven = Delicious!

Peanut Butter + M&Ms = Happy!

(5 x 1) + Hungry Kids = Zero!

Soft, chewy, and sweet!These M&M peanut butter bars are not only insanely easy to make but they are so delicious. I recommend a big glass of milk or a cup of coffee. And small bites that savor each morsel.

Lots of possible variations. You’ll love that you can make easy changes to this recipe, too. M&Ms aren’t the only candies that taste great in bars.

Kid-Friendly Beginner Recipe

Since there are only five ingredients, this recipe is perfect for beginners. Let your kids help you make peanut butter cookie bars. They’ll love measuring the baking mix and brown sugar. Teach them how to crack eggs into a small bowl before they add them to the peanut butter. They’ll get good practice stirring and blending and they’ll love using their hands to mix the dough and press the M&Ms in.

I’ll give you a quick preview of the recipe here but as always, look for the printable recipe card near the end of the post. It has complete instructions and nutrition information.

Ingredient List

What are the five magic ingredients? I bet you’ve already figured it out!

• Peanut Butter: Creamy or chunky, doesn’t matter. Avoid the natural peanut butters that have to be stirred; choose a brand like Jif or Skippy.
• Eggs: A couple of eggs hold this business all together.
• Brown Sugar: The molasses flavor adds to the profile of these cookies. Dark brown sugar works as well as light brown sugar.
• All-Purpose Baking Mix: An example of this is Jiffy or Bisquick. The mix comes in a large box and is a shortcut product used to make pancakes, waffles, or biscuits. If you’d like, you can use homemade Bisquick.
• M&Ms: Who doesn’t love these chocolate candies? Use the regular assorted colors or buy a color that’s coordinated with an occasion.

How To Make Peanut Butter Cookie Bars

Turn your oven on, wash your hands, and let’s get started! You’ll need an 8 x 8 inch baking pan, or an equivalent of that. Spray it lightly with cooking spray.

In a mixing bowl, blend together the peanut butter and eggs until the two ingredients are nice and smooth.

Add the brown sugar and stir again. The mixture should be well-blended.

Measure out the baking mix and add that to the bowl. Mix it in as well as possible. The dough is very thick. You may have to use your hands to combine it. I usually do.

Add the M&Ms and stir some more. Again, hands are totally permissible. If all of the M&Ms don’t stay in the dough, don’t worry.

Turn the dough out into the prepared pan and press it into an even layer. Press any stray or remaining M&Ms right into the dough.

Pop those babies right into the oven and bake for 35 to 40 minutes or until they turn golden brown. Be sure to notice the sweet aroma emanating from your kitchen.

Cool the bars before cutting into 16 squares or whatever size you like. Maybe 4 big squares!

FAQs

Make These Bars Your Own

• Different mix-ins. Try mini M&Ms, peanut butter M&Ms, or Reese’s Pieces. Chocolate chips, white chocolate chips, or mini chocolate chips are great too.
• Gluten-free. Use a gluten-free baking mix, such as King Arthur Gluten-Free All-Purpose Baking Mix.
• Turn the bars into dessert. Top each square with a scoop of vanilla ice cream, a drizzle of homemade hot fudge or homemade caramel sauce, and sprinkle on a few more M&Ms for garnish. This is really, really good when the bars are still slightly warm.
• Love M&Ms? Try my modestly named — they really are pretty perfect!
• No-bake bars: If you don’t want to turn your oven on, try no-bake peanut butter bars. They taste just like Reese’s Peanut Butter Cups.

Storage Tips

Refrigerate/Freeze: Peanut butter cookie bars will keep in an airtight container for up to 3 days on the counter. If you need to store them longer than that, refrigerate or freeze them.

For Peanut Lovers

• Peanut Butter Popcorn
• Chocolate Peanut Butter Pie (no bake!)
• Buckeyes
• No Bake Peanut Butter Bars
• Peanut Butter Trail Mix Recipe
• Oh Henry Bars