A winner from Southern Living where it is a 5 star recipe!
Whisk together melted butter and next 5 ingredients in a large bowl. Stir in flour and pecans. Pour batter into a greased and floured 15x10 jellyroll pan.
Bake at 350º for 20 to 25 minutes or until a wooden toothpick inserted in middle of cake coumes out clean. Remove from oven, top warm cake with marshmallows and return to oven for 5 more minutes.
For the frosting, combine all ingredients with a mixer until well mixed.
Drizzle chocolate frosting over warm cake.
Cool completely.
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