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Peanut Butter Cookie Bars

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These Peanut Butter Cookie Bars are soft, thick, and chewy with rich peanut butter flavor, topped with a smooth chocolate layer and finished with mini peanut butter M&M’s for the perfect sweet and crunchy bite.

Ingredients

1 cup (226g) salted butter, melted and slightly cooled

2 large eggs

2 cups (440g) brown sugar, packed

1 tablespoon vanilla extract

1 cup (240g) creamy peanut butter (not natural)

2 1/2 cups (350g) all-purpose flour

1/2 teaspoon baking powder

1 1/4 cups mini peanut butter M&M’s

1 1/2 cups chocolate chips

1 tablespoon butter (for topping)

1/2 cup mini peanut butter M&M’s (for decoration)

Instructions

  1. Preheat oven to 350°F (175°C). Spray a 9×13-inch baking dish with non-stick spray.
  2. In a medium bowl, whisk together the flour, baking powder, and 1 1/4 cups mini peanut butter M&M’s.
  3. In a large bowl, whisk the melted butter and eggs until smooth. Add the brown sugar and vanilla extract and whisk until fully combined.
  4. Add the creamy peanut butter and whisk until smooth and thick.
  5. Gradually stir the dry ingredients into the wet ingredients until just combined. Do not overmix.
  6. Spread the batter evenly into the prepared baking dish, smoothing the top.
  7. Bake for 30–35 minutes, or until the top is set and golden brown. Allow the bars to cool almost completely in the pan.
  8. For the topping, melt the chocolate chips and 1 tablespoon butter in the microwave in 20-second intervals at 50% power, stirring between each, until smooth.
  9. Spread the melted chocolate evenly over the cooled bars and sprinkle with the remaining 1/2 cup mini peanut butter M&M’s.
  10. Allow the chocolate to set completely before slicing into 24 bars.

Notes

If using unsalted butter, add 1/4 teaspoon salt to the flour mixture.

Do not overbake to keep the bars soft and chewy.

Store in an airtight container at room temperature for up to 4 days or refrigerate for up to 1 week.

Freeze in a sealed container for up to 2 months and thaw at room temperature before serving.

Let the chocolate fully set before slicing for clean cuts.

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