Preheat oven to 375 degrees.

Grind the shortbread cookies in a food processor until finely ground. Add the peanut butter and continue to process until all of the cookie crumbs are moistened with peanut butter. Press the mixture into a 23 cm pie pan, forming a thicker edge near the rim. Bake in the preheated oven for 6 minutes. Remove pie shell and reduce oven temperature to 350 degrees.

Meanwhile mix the brown sugar, corn syrup, flour, eggs and vanilla in a bowl just until blended. Stir in the chopped peanut butter cookies and the peanuts. Pour into the partially baked pie shell and return to the oven to bake for about 45 minutes, until the top is browned but the filling is still gooey in the center. Cool on a rack for at least an hour before serving.

Per serving: 500 calories, 66 gm carbohydrates, 80 mg cholesterol, 435 mg sodium, 11 gm protein, 23 gm fat, 3 gm saturated fat Andrew Schloss is a cookbook author whose "One-Pot Cakes," written with Ken Bookman, was published earlier this year by William Morrow.

The Washington Post