Line 8-inch square pan with foil, with ends of foil extending over sides; spray with cooking spray.
Combine flour, baking powder and 1/2 cup nuts. Microwave peanut butter and butter in large microwaveable bowl on HIGH 1 min. or until butter is melted; whisk until well blended. Add sugar; mix well. Stir in egg, then flour mixture.
Pour into prepared pan.
Bake 20 to 24 min. or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.)
Sprinkle 1/2 cup chocolate chips evenly over dessert; let stand 2 min. or until softened. Spread to evenly cover top of dessert with chocolate. Top with peanut butter chips, remaining chocolate chips and remaining nuts. Cool completely.
Use foil handles to remove dessert from pan before cutting into squares.
Calories From Fat
% Daily Value*
Total Fat 16g
Saturated Fat 7g
Trans Fat 0g
Total Carbohydrates 27g
Dietary Fibers 2g
* Percent Daily Values are based on a 2,000 calorie diet.
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.