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December 30, 2023

Best Monster Cookie Bars (without butter)

Click Here to…..JUMP TO RECIPE

These are, oh my! SO GOOD! Monster Cookies are known mainly for their oatmeal, peanut butter, M & Ms, and chocolate chips for extra chocolaty goodness. I enjoy them as Monster Cookie Bars more than I do as a cookie!

These cookie bars are unique in that they use oil instead of butter. I believe this is a big reason why they are so soft and chewy, moist and crumbly. 

four monster cookie bars stacked on a white plate

These Monster Cookie Bars can be baked and then frozen up to 3 months for any upcoming event. You can switch out flavors and M&M colors to match your event and taste buds.

This recipe uses peanut butter chips instead of peanut butter from a jar and can I just mention….. I love peanut butter chips!?! No fumbling around with the peanut butter jar and spatula. No wrestling the sticky peanut butter out of the measuring cup either. Phew!  

monster cookie bars and M&M's spread out on a white counter

How to make Monster Cookie Bars

This recipe was inspired by one of my favorite chocolate chip oatmeal bar recipes. The add-ins have been adjusted and the vanilla increased. The dry ingredients include flour, white & brown sugar, baking soda, baking powder, salt, rice krispies, oatmeal, peanut butter chips, chocolate chips, and M&M’s.

flour, white and brown sugar, baking soda, baking powder, rice krispies, oatmeal, chocolate chips, peanut butter chips and M&M's in seperate bowls on a yellow counter

The wet ingredients are vanilla, eggs, and canola oil.

vanilla in a bowl, oil in a bowl, 2 eggs in a bowl

The wet and dry ingredients are combined separately and then together.

wet ingredients in a small bowl and dry ingredients in a big bowl set on a white counter

Pour into a greased 9×13 cake pan and pat down gently. Bake for about 20 minutes or until the edges have lightly browned. The pan is greased and because these bars are made with oil they come out of the pan easily.

If making for an event, you can set aside about 1/4 cup of the M&Ms (or whatever candies you chose) to put on top of the bars before baking. This will ensure plenty of the color is showing on top of the bars.

monster cookie bar ingredients mixed together in a bowl with spoon
cake pan with baked monster cookie bars

Change the Flavors

  • Swap out chocolate chips for more peanut butter chips
  • Use white chocolate chips or milk chocolate chips instead of semi-sweet
  • Butterscotch chips
  • Reeces pieces M&Ms
  • Candy such as crushed heath bars, Reece’s peanut butter cups, or eyeball candies
  • Crushed pretzels
  • raisins
  • nuts
a monster cookie bar on a white plate surrounded by other bars and a glass of milk on a white counter

Change the Colors

  • Fall & Halloween – peanut butter Reece’s pieces M&M’s, candy eyeballs, candy corn
  • Valentine’s Day – red, pink and white M&M’s, Cinnamon Imperials, Valentine sprinkles
  • Christmas – green and red M&M’s, white chocolate chips, Christmas sprinkles
  • Fourth of July – red, white, and blue M&M’s, Patriotic sprinkles
  • Sports – M&M’s and/or sprinkles that coordinate with your favorite sports team
  • Graduation School Colors – M&M’s and/or sprinkles that coordinate with your school colors
  • Birthday Parties – M&M’s or candies that reflect the person’s favorite colors and/or flavors

If you can’t find the exact M&M colors you want at the store and you don’t mind spending extra……you can visit M&M’s website HERE to order any specific colors you may need for your event. I do not make a profit off of the M&M link.

Here are more scrumptious bar recipes to try….

Easy to Make – Applesauce Bars – with Vanilla Icing

Easy Buckeye Brownies Recipe (peanut butter brownie)

monster cookie bar on a white plate

Best Monster Cookie Bars (without butter)

These are, oh my! SO GOOD! Monster Cookies are known mainly for their oatmeal, peanut butter, M & Ms, and chocolate chips for extra chocolaty goodness. These cookie bars are unique in that they use oil instead of butter. I believe this is a big reason why they are so soft and chewy, moist and crumbly. 
Print Recipe Pin Recipe
Prep Time 10 minutes mins
Cook Time 20 minutes mins
Total Time 30 minutes mins

Ingredients
  

  • 2 cups flour
  • ½ cup white sugar
  • 1 cup brown sugar gently packed
  • 1 tsp baking soda
  • 1 tsp baking powder
  • 1 tsp salt
  • 1 1/2 cups quick cook oatmeal
  • 1 cup rice krispies
  • 1/2 cup chocolate chips
  • ¾ cup peanut butter chip
  • ¾ cup M & M candies
  • 1 cup oil I use Canola oil
  • 2 eggs
  • 1 tbls vanilla

Instructions
 

  • Preheat the oven to 350 degrees. Grease a 9 x 13 cake pan.
  • In a large mixing bowl, stir the dry ingredients together and set aside.
  • In a smaller mixing bowl combine the liquid ingredients with a fork (do not beat the eggs, just stir until combined).
  • Add the wet ingredients to the dry ingredients and stir until combined.
  • Pour into the greased cake pan and pat down gently. Bake for about 20 minutes or until edges are lightly browned.

Notes

The bars slide out of the pan easily because of the oil in the dough and the greased cake pan. After the bars are baked and cooled you can store them on the counter for 3 or 4 days. Or freeze them for up to 3 months. Make sure they are tightly sealed.
If you want to make sure plenty of color is visible from the M&M’s, set aside 1/4 cup of the M&M’s to gently press on top of the bars before baking.
Try different candy flavors like Reese’s pieces M&M’s or crushed Heath bars. The chocolate chips can also be swapped out for butterscotch, milk chocolate, or white chocolate. 
Buy M&M colors or sprinkles that match the holiday, sporting event, birthday party, or graduation party.   

Filed Under: Dessert, Recipes Tagged With: cookie bars, dessert, M&M's, monster cookie bars, Monster Cookies

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living homeward about me

Hi, I’m Katie! I’m a chocolate-loving wife and mother of two! Here at Living Homeward, I share timeless recipes and tips for all who work endlessly to make their house a home.

More about Katie here.

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