1-Make the crust: Preheat oven to 375°F. Crush 18 Oreos into fine crumbs, mix with 3 tbsp melted butter, press into a 9-inch pie plate, bake 8-10 minutes, then cool completely.

2-Melt the chocolate: Break 8.5 oz Symphony bars into pieces, combine with 1/4 cup milk, microwave at 50% power in 30-second bursts until smooth, then let cool until barely warm.

3-Whip the cream: In a chilled bowl, whip 1 cup heavy cream to stiff peaks, then beat in 1 tsp vanilla extract.

4-Combine the filling: Gently fold the whipped cream into the cooled chocolate mixture until no white streaks remain, keeping it light and airy.

5-Fill and freeze: Pour filling into the cooled crust, smooth the top, cover tightly with plastic wrap and foil, then freeze for at least 3 hours, or overnight for cleanest slices.

6-Serve: Let pie sit at room temperature 10-15 minutes, run a sharp knife under hot water and wipe dry, then slice. Top with whipped cream and broken Symphony bar pieces if desired.