5 Ingredient Peanut Butter Cookie Bars with M&Ms

4.38 from 32 votes

Irresistible M&M peanut butter cookie bars with only 5 ingredients! Easy to make and so delicious!

Prep Time10

Cook Time40

Total Time50

Course: Cookies & Bars

Cuisine: American

Servings:

¾ cup peanut butter (creamy or chunky)
2 large eggs
1 cup packed brown sugar
2 cups all-purpose baking mix (such as Bisquick or Jiffy)
1 bag (12 oz.) M&Ms, about 1 ⅔ cups (use regular, mini, peanut butter, Reese's Pieces, or even chocolate chips)

Preheat oven to 325F°. Spray an 8-inch square pan with cooking spray.
In a large bowl, combine peanut butter and eggs until well mixed and smooth.
¾ cup peanut butter, 2 large eggs
Add brown sugar and stir until well-combined.
1 cup packed brown sugar
Stir in baking mix until moistened (I use my hands - it is a very thick batter).
2 cups all-purpose baking mix
Fold in M&Ms. Again, using your hands works best for this step. Don't worry if some of the M&Ms don't stick in the dough.
1 bag (12 oz.) M&Ms, about 1 ⅔ cups
Spread mixture evenly in greased pan, pressing any remaining M&Ms into the dough.
Bake for 35 to 40 minutes or until golden brown. Cool and cut into 16 squares.

Storage: Bars will keep in a covered container on the counter for up to three days. If you want to store them longer, store in the refrigerator or freezer.
Add-ins: Possible substitutions for plain M&Ms: Reese's Pieces, peanut butter M&Ms, dark chocolate M&Ms, etc. Chocolate chips or mini chocolate chips are good, too.
Make it a dessert: Top a bar with vanilla ice cream, hot fudge or caramel sauce, and a sprinkle of M&Ms. Especially good when the bars are still warm!

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