Product Recall: Kraft and Polly-O String Cheese and String Cheese Twists. Click here
MICROWAVE chocolate and milk in large microwaveable bowl on HIGH 2 min.; stir until chocolate is completely melted. Cool 20 min., stirring occasionally.
ADD sugar and vanilla to COOL WHIP; stir until well blended. Stir half into chocolate mixture. Add remaining COOL WHIP mixture; mix lightly. Spoon into crust.
REFRIGERATE 4 hours.