In small mixer bowl, beat together 1/2 c peanut butter, butter, corn syrup and vanilla. Stir in icing sugar until well blended.
Melt chocolate chips in measuring cup in the microwave or in a small pot on the stove and stir in 1/4 c peanut butter. Gently stir this mixture slightly back into the peanut butter for a marble effect.
Pour into a small pie plate or pan and refrigerate until set. Keep in refrigerator. Cut into squares.
Co-op Magazine April 1993 shared by Elizabeth Rodier
PEANUT BUTTER TRIVIA * Canadians eat a total of 80,849 kg of peanut butter a day (about 177,868 pounds or almost 89 tons) * Smooth peanut butter outsells crunchy by 3 to 1 * Children and men prefer smooth peanut butter; women prefer crunchy * Most peanut butter is eaten at breakfast * One acre of land grows enough peanuts to make 30,000 peanut butter sandwiches