Combine pwd. sugar and peanut butter. Put 1/2 of mixture in bottom of baked pie shell, reserving remainder. In small bowl mix sugar, corn starch, flour and salt. Blend in 1/4 c. milk and egg yolks. Combine 1/3 C. sugar and 2 C. milk. Bring to a boil and add yolk mixture. Boil 4 min. or until thick. Remove from heat and add vanilla, butter and an additional 1/4 C. (or more) peanut butter. Cool. Pour into pre-baked pie shell. Spread Cool Whip over all. Top with remaining powdered sugar/peanut butter mixture. Sprinkle chopped peanuts on top if desired.
-from Elaine Unruh