Prepare cake according to package directions, but substitute brewed coffee for the water, and add 1 cup of chopped pecans.
Pour into a 13x9 inch pan and bake according to directions.
Top the baked cake with one bag of mini marshmallows, and bake for an additional 5 minutes, or until the marshmallows are very lightly toasted.
Beat the butter, milk, powdered sugar, and cocoa powder together until smooth.
Spread over the cooled cake.
Let the frosting set and then cut into slices.
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