Melt chocolate chips in top of double boiler over hot (not boiling) water OR in microwave oven according to package instructions. Quickly add peanut butter and milk, stirring until well mixed. Pour into an 8 x 8-inch pan which has been lightly buttered or sprayed with vegetable spray. Refrigerate to chill. Cut into 1-inch pieces. Makes 64 pieces, 1-1/4 pounds.