These loaded peanut butter cookie bars are the perfect treat for peanut butter lovers! They're packed with peanut butter flavor, and addictingly delicious!
Preheat the oven to 375. Line a 9 x 9 baking dish with parchment or spray with cooking spray.
In a large bowl or the bowl of a stand mixer, beat together the butter, sugar, brown sugar, peanut butter, and egg until smooth.
Stir in the flour, baking soda, and salt, to form a thick dough. Fold in the Reese's pieces and peanuts, reserving 1/4 cup of each to sprinkle on top of the dough.
Spread the dough evenly in the prepared pan, and top with the remaining Reese's pieces and peanuts. Bake 25-30 minutes, or until lightly browned around the edges, and a toothpick inserted in the center comes out clean.