Sky High Chocolate Mousse Pie

Name: Sky High Chocolate Mousse Pie
Prep time: 40 min
Cook time: 18 min
Total time: 58 min
Cuisine: American
Ingredients: 22 regular Oreo cookies (not Double Stuf); 5 Tablespoons (71g) unsalted butter, melted; 8 ounces (226g) unsweetened chocolate, finely chopped (two 4-ounce bars); 2 Tablespoons (28g) unsalted butter; 4 large egg whites* (120g); 1 cup (200g) granulated sugar; 1/4 teaspoon cream of tartar*; 2 cups (480g/ml) heavy cream, cold; 6 whole Oreos, crushed into crumbs (68g); 1 cup (240g/ml) heavy cream, cold; 2 Tablespoons granulated sugar; 1/2 teaspoon pure vanilla extract; optional: chocolate curls or shavings for topping*