Heat most of the chocolate with milk in a microwave-safe bowl on high for 1.5-2 minutes.

Stir until the chocolate is completely melted. Alternatively, melt in a heavy saucepan over very low heat.

Beat in cream cheese, sugar (optional), and remaining milk until smooth.

Gently stir in the whipped topping until well combined.

Spoon the chocolate mixture into the chocolate wafer crust.

Freeze the pie until firm, about 1 hour.

Remove the pie from the freezer.

Let the pie stand at room temperature for 30 minutes to soften slightly.

Melt the remaining chocolate in the microwave for approximately 15 seconds.

Drizzle the melted chocolate over the pie before serving.

Cut and serve.