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Prepare Pillsbury Purely Simple Chocolate cake mix as directed on package, pour into 9x13 inch pan and bake.
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When cake is done, sprinkle with miniature marshmallows and nuts.
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Put back in oven, and bake until marshmallows begin to melt.
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Remove from oven and let cool.
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In a heavy sauce pan, over medium heat, bring butter, milk, and cocoa to a boil, stirring until butter melts.
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Remove from heat; beat in powdered sugar and vanilla.
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Pour frosting evenly over cake in pan.
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Serve warm.