Ingredients
1/2 cup butter , at room temperature
2/3 cup granulated sugar
1/4 cup peanut butter, smooth
1 large egg
2 tbsp unsweetened cocoa powder
1/2 tsp baking powder
1/4 tsp salt
2 cups all-purpose flour
1/2 cup unsalted peanuts, coarsely chopped
Preparation
Beat butter, sugar and peanut butter in a large bowl with an electric mixer until pale and fluffy. Beat in egg, cocoa, baking powder and salt.
With a mixer on low speed, beat in flour until blended to form a dough.
Shape the dough into a log 12 inches long and 1.5 inches thick. Roll in the nuts.
Wrap in plastic wrap or waxed paper, transfer to a cookie sheet and refrigerate for at least 4 hours.
Heat oven to 350 degrees.
Cut the log in 32 slices. Place 1 inch apart on a greased cookie sheet.
Bake for 12 to 15 minutes until the cookies feel firm. Transfer to a wire rack to cool before serving.