Preheat oven to 350 degrees F. Coat a 9×9-inch square baking dish with cooking spray and set aside. In a food processor, combine the flour, brown sugar and salt. Pulse until combined. Add the butter and pulse until the mixture resembles coarse meal. Add the peanut butter and process until crumbly.
In a small, combine ½ cup of the peanut butter mixture with the peanuts and set aside. Press the rest of the peanut butter mixture into the bottom of the prepared pan with fingers. Top with an even layer of the jelly. Sprinkle the peanut-crumb mixture over the top.
Bake in the preheated oven for 45 minutes, or until lightly browned. Let cool and cut into squares.