Black Cocoa Halloween Layer Cake

Name: Black Cocoa Halloween Layer Cake
Prep time: 1 h
Cook time: 30 min
Total time: 1 h 30 min
Cuisine: American
Ingredients: 1 3/4 cup cake flour (substitute all purpose flour); 1/2 cup black cocoa powder; 2 teaspoons baking powder; 1/2 teaspoon kosher salt; 3/4 cup unsalted butter (melted); 1 1/2 cups granulated sugar; 3 large eggs (room temperature ); 1 teaspoon vanilla extract; 3/4 cup whole milk; 1/4 cup espresso or brewed coffee (substitute milk); 2 cups unsalted butter (room temperature); 3 cups powdered sugar; 1 cup black cocoa powder; 2-3 tablespoons heavy cream; 1 cup marshmallows (melted); ghost meringue cookies