Step 1: Prepare the Crust : In a bowl, mix the crushed chocolate cookies, melted butter, and sugar until combined. Press the mixture firmly into the bottom and up the sides of a 9-inch pie dish. Freeze the crust for about 15–20 minutes to set while you prepare the filling.
Step 2: Prepare the Coffee Ice Cream Filling : In a small cup, dissolve espresso powder in hot water and let cool slightly. In a large mixing bowl, stir the softened coffee ice cream until smooth and creamy. Mix in the espresso (for a stronger mocha flavor). Swirl in the chocolate fudge sauce gently using a spoon — don’t overmix; you want visible ribbons of fudge throughout.
Step 3: Assemble the Pie :Spoon the mocha ice cream mixture into the prepared crust. Smooth the top with a spatula. Cover the pie tightly with plastic wrap or foil and freeze for at least 4–6 hours, or until completely firm.
Step 4: Prepare the Whipped Cream Topping :Beat the heavy cream, powdered sugar, and vanilla extract together in a chilled bowl until soft peaks form. Spread or pipe the whipped cream over the frozen pie. Drizzle extra chocolate fudge sauce on top and dust with cocoa powder or sprinkle grated chocolate for garnish.
Step 5: Final Chill : Return the pie to the freezer for another 30 minutes before serving to allow the topping to firm up slightly.