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 (72g) unsalted butter, melted; two 4-ounce (115g) bars unsweetened chocolate, coarsely chopped (8 ounces/230g total); 2 Tablespoons (30g) unsalted butter; 4 large egg whites* (120g); 1 cup (200g) granulated sugar; 1/4 teaspoon cream of tartar*; 2 cups (480ml/g) heavy cream/heavy whipping cream; 6 whole Oreos, crushed into crumbs (66g); 1 cup (240ml/g) heavy cream/heavy whipping cream; 1 Tablespoon (13g) granulated sugar; 1/2 teaspoon pure vanilla extract; optional: chocolate curls or shavings for topping*