Cookies And Cream Cake

Name: Cookies And Cream Cake
Cook time: 2 h 25 min
Total time: 2 h 25 min
Cuisine: American
Ingredients: Cooking spray; 2 cups (about 8 ½ ounces) all-purpose flour; 1.5 cups granulated sugar; 0.5 cup Dutch-process cocoa (such as Hershey's Special Dark); 2 teaspoons baking soda; 1 teaspoon baking powder; 1 teaspoon kosher salt; 0.5 cup vegetable oil; 3 large eggs; 1 tablespoon vanilla extract; 1 cup whole buttermilk; 0.5 cup tap water; 10 chocolate sandwich cookies (such as Oreos), crushed; 0.5 cups tap water; 6 large egg whites; 2 cups (16 ounces) unsalted butter, cubed and softened; 10 chocolate sandwich cookies (such as Oreos), finely crushed, plus more for garnish; 2 teaspoons vanilla extract; 0.5 teaspoon kosher salt