IN A FOOD PROCESSOR OR BY HAND, COMBINE SUGAR, PEANUT BUTTER, EGG AND VANILLA, STIR IN PEANUTS. ROLL DOUGH INTO SMALL BALLS AND PLACE ON A GREASED BAKING SHEET ABOUT 2" APART.
FLATTEN BALLS WITH TINES OF FORK DIPPED IN FLOUR.
SPRINKLE WITH CHOCOLATE CHIPS.
BAKE IN A PREHEATED 325° OVEN FOR ABOUT 12 TO 13 MINUTES OR UNTIL LIGHTLY BROWNED. REMOVE FROM OVEN AND LET COOL ON A WIRE RACK.