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Oatmeal Peanut Butter Cookie Bars

Chewy oat and peanut butter cookie bars studded with chocolate and peanut butter chips for a decadent, easy-to-slice treat.
Prep Time15 minutes
Cook Time25 minutes
Total Time40 minutes
Servings: 12 servings

Ingredients

  • 2 1/4 cups all-purpose flour
  • 1 1/2 cups old fashioned oats
  • 3/4 teaspoon baking powder
  • 1/4 teaspoon baking soda
  • 1/2 teaspoon fine sea salt
  • 3/4 cup unsalted butter, melted 1 1/2 sticks
  • 2 cups packed light brown sugar
  • 3/4 cup creamy peanut butter room temperature
  • 2 large eggs
  • 2 teaspoons vanilla extract
  • 1 cup semisweet chocolate chips
  • 1 cup peanut butter chips
  • 2/3 cup mini peanut butter cups or peanut butter M&Ms
  • 1/2 teaspoon flake sea salt such as Maldon, for sprinkling

Instructions

  • Preheat the oven to 350°F (175°C). Line a 13x9-inch baking pan with parchment paper, leaving an overhang for easy removal.
  • In a medium bowl, whisk together the flour, oats, baking powder, baking soda, and 1/2 teaspoon fine sea salt until evenly combined; set aside.
  • In a large bowl, stir the melted butter, packed brown sugar, and creamy peanut butter until smooth. Whisk in the eggs and vanilla until fully incorporated.
  • Fold the dry ingredients into the wet mixture until just combined. Then gently fold in the semisweet chocolate chips, peanut butter chips, and mini peanut butter cups, reserving a few tablespoons of each to sprinkle on top if desired.
  • Press the dough evenly into the prepared pan. Scatter the reserved chips and mini cups over the top, then lightly sprinkle with flake sea salt.
  • Bake for 25 to 28 minutes, or until the edges are lightly browned and the center is just set; avoid overbaking.
  • Remove from the oven and cool the bars completely in the pan. Use the parchment overhang to lift the slab out, then slice into squares, rectangles, or triangles to serve.

Equipment

  • 13x9-inch baking pan
  • Parchment Paper
  • large mixing bowl
  • medium mixing bowl
  • Whisk
  • rubber spatula or wooden spoon
  • Measuring cups and spoons
  • Oven

Notes

  • Line the pan with parchment for easy removal.
  • Do not overbake; bars continue to set as they cool.
  • Reserve some chips for an attractive topping.
  • Room-temperature peanut butter mixes more smoothly into the batter.