9 While the cake is cooling, prepare the chocolate frosting. In a medium saucepan, melt the butter over low heat. Stir in the milk and cocoa powder, whisking until smooth. Remove the pan from the heat.
10 Gradually add the powdered sugar, one cup at a time, stirring well after each addition. Stir in the vanilla extract until the frosting is smooth and creamy.
11 Once the cake has cooled, pour the chocolate frosting over the marshmallow layer, spreading it evenly with a spatula.
12 Allow the frosting to set before serving. You can refrigerate the cake for about 1 hour to help the frosting firm up.
13 Slice and serve the Mississippi Mud Cake, and enjoy its rich, chocolatey goodness!
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