IN MEDIUM SAUCEPAN, MELT BUTTER, STIR IN BROWN SUGAR AND MILK. BRING TO A BOIL, BOIL AND STIR FOR 2 MINUTES. REMOVE FROM HEAT; STIR IN PEANUT BUTTER AND VANILLA. MIX IN CONFECTIONER'S SUGAR;BEAT UNTIL SMOOTH. SPREAD INTO BUTTERED 9-INCH SQUARE PAN. CHILL UNTIL FIRM. CUT INTO SQUARES.
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