Bake pie crust according to package directions. In medium microwave bowl combine chocolate chips and milk. Microwave on medium (50% power) for 1 1/2 minutes, stirring every 30 seconds. Stir until chocolate is completely melted and smooth, stir in vanilla.
Pour chocolate into baked pie crust. Refrigerate at least 2 hours. (I let mine set overnight.) Before serving stir together strawberries and whipped topping in medium bowl. Spread over chocolate layer.