If you love the classic taste of monster cookies but want an easier, no-fuss way to bake them, these Monster Cookie Bars are the perfect treat! Packed with peanut butter, oats, chocolate chips, and colorful candy-coated chocolates, they’re chewy, rich, and full of flavor in every bite. Best of all, they’re naturally gluten-free since they don’t contain any flour—just wholesome oats holding everything together. Whether you’re making them for a church potluck, bake sale, or a sweet treat at home, these bars are guaranteed to be a crowd-pleaser. Get ready to enjoy a dessert that’s as fun as it is delicious!

Monster Cookie Bars Recipe
Ingredients
- 1/2 cup margarine (or butter)
- 1 cup packed brown sugar
- 1 cup granulated sugar
- 1 1/2 cups creamy peanut butter
- 3 large eggs
- 2 tsp vanilla extract
- 4 1/2 cups quick oats
- 1 teaspoon baking soda
- 1 cup M&Ms
- 1 cup chocolate chips
Instructions
- Preheat oven to 350°F. Grease 9x13" pan (or cookie sheet if you want thinner bars) with cooking spray.
- In a large bowl or stand mixer, beat butter, brown sugar, granulated sugar, and peanut butter until fluffy.
- Add eggs and vanilla, then mix.
- Stir in oats and baking soda until combined.
- Fold in M&M’s and chocolate chips.
- Spread dough evenly onto pan.
- Bake for 17-20 minutes, until edges are lightly browned. The center will look soft but will set as it cools.
- Let cool for at least 1 hour before cutting to allow bars to firm up. Do not overbake!
Nutrition Information:
Yield: 40 Serving Size: 1Amount Per Serving: Calories: 194Total Fat: 10gSaturated Fat: 3gTrans Fat: 0gUnsaturated Fat: 6gCholesterol: 15mgSodium: 108mgCarbohydrates: 23gFiber: 2gSugar: 16gProtein: 4g