Dark Chocolate Mississippi Mud Cake

I remember this cake from my childhood.  One of our relatives would make it for family reunions so that was definitely one thing to look forward to going to them.  I decide to make it using dark chocolate cocoa.

Dark Chocolate Mississippi Mud Cake

2 cups flour

2 cups sugar

1 tsp baking soda

1/2 tsp salt

1 cup butter

1 cup water

1/3 cup dark chocolate cocoa ~ I used King Arthur Double Dutch Dark Cocoa

1/2 cup buttermilk

2 large eggs

1 tsp vanilla

mini marshmallows - enough to cover the pan evenly (just over 1/2 bag)

Mix dry ingredients in a large bowl.  In a small saucepan, melt the butter with the cocoa and water.  Bring to a boil and stir it into the dry ingredients in the bowl.  Add in the buttermilk, eggs and vanilla.  Pour into a greased 9 x 13 pan.  Back for 40 minutes at 350 degrees.  Immediately cover the hot cake with the mini marshmallows.  

Icing

1/3 cup butter

1/3 cup buttermilk

1/3 cup dark cocoa

1 tsp vanilla

3 cups powdered sugar

Melt the butter.  Add in the buttermilk and cocoa powder and cook until the icing thickens.  Remove from heat and add in vanilla and powdered sugar.  Drizzle the warm icing over the marshmallows.  Refrigerate until the icing sets.