Microwave chocolate and milk in large microwaveable bowl on high 2 to 3 minutes or until chocolate is almost melted, stirring after each minute. Stir until chocolate is completely melted.
Add vanilla and pecans; mix well. Spread into foil- lined 8 inch square pan.
Refrigerate 2 hours or until firm. Cut into 1 inch squares.
Makes about 2 lbs. or 16 servings