Cream oleo and sugars; add egg, peanut butter, soda, salt and vanilla. Mix well. Add flour and oatmeal and mix well. Spread on greased 13×9-inch pan. Bake at 350° 20 to 25 minutes, until lightly browned. Sprinkle immediately with 1 cup semi-sweet chocolate chips. Let stand 5 minutes and spread evenly. Drizzle with peanut butter mixture. Cool.
Peanut Butter Mixture: Mix powdered sugar, 1/4 cup peanut butter and milk. Spread on bars and swirl with knife. Cut into strip-sized bars.