Preheat oven to 400F. Line 10-by-15-by-1-inch pan with aluminum foil. Spray foil with nonstick cooking spray then lay saltines flat in single layer on prepared pan. Set aside.
In heavy duty, 1-quart saucepan over medium heat, combine butter, peanut butter and sugar. Stir constantly until butter and sugar are melted, bringing mixture to boil. Boil 3 minutes, stirring frequently. Pour cooked mixture over saltines and bake for 5 minutes.
Remove from oven and sprinkle chocolate chips over saltines. Let cool 3 minutes then spread melted chocolate completely over saltines.
Sprinkle peanut butter chips evenly over chocolate. Return pan to oven 1 minute to soften chips. Pull pointed tines of fork through softened peanut butter chips to partially cover chocolate. Sprinkle chopped peanuts on top, gently pressing into candy.
Let cool on rack about 15 minutes then place in freezer 3 minutes. Remove from freezer and break into pieces. Store in airtight container.
