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A peanut butter cookie bar on top of a pile.
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5 from 1 vote

Peanut Butter Cookie Bars

I love peanut butter, and my son adores chocolate. I tried for a long time to find the perfect recipe to make both of us happy. This recipe is perfection! The cookie bars are soft, chewy and thick with a chocolate layer on top covered with a sprinkling of M & M's. You will just have to check out these peanut butter cookie bars for yourself!
Prep Time10 minutes
Cook Time35 minutes
Total Time45 minutes
Servings: 24
Calories: 217kcal

Ingredients

Chocolate Topping

Decoration

  • ½ cup mini peanut butter M&M’s

Instructions

  • Preheat an oven to 350 Fahrenheit and spray a 9x13 baking dish with non-stick spray. *see note
  • Add the flour, baking powder, and mini peanut butter M&M’s together in a mixing bowl and whisk together.
  • In a large mixing bowl whisk the slightly cooled butter and eggs together till smooth.
  • Add the brown sugar, and vanilla and whisk again till smooth.
  • Add the peanut butter and whisk till smooth.
  • Add the flour mixture and M&Ms and mix with a spoon till just combined.
  • Turn the batter out into the prepared baking dish, smoothing the top slightly so it’s even.
  • Bake for 30-35 minutes or until the top is set and golden brown.
  • Remove from oven and let cool in baking dish till nearly completely cool before making the topping.
  • In the microwave in 20 second increments at 50% power, melt the chocolate chips and butter together.
  • Once melted, spread the chocolate on top of the bars and sprinkle with the peanut butter M&M’s

Notes

  • If you use unsalted butter in the batter, add ¼ teaspoon salt to your flour mixture.
  • If you use a glass baking dish your cook time will likely be a few minutes less than if you use a metal dish.
  • I prefer using a baking dish that has more defined corners than rounded edges because it makes more bars squared.
  • If you can’t find mini peanut butter M&M’s you can use regular M&M’s. I found mini peanut butter M&M’s at my local Walmart.
  • If you don’t want to make as many bars, you can half this recipe and bake in a 8x8 inch baking dish.

Nutrition

Calories: 217kcal | Carbohydrates: 38g | Protein: 4g | Fat: 17g | Saturated Fat: 8g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 5g | Trans Fat: 0.3g | Cholesterol: 37mg | Sodium: 131mg | Potassium: 140mg | Fiber: 1g | Sugar: 25g | Vitamin A: 273IU | Calcium: 40mg | Iron: 1mg