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Cake mix.
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in a large mixing bowl cream butter and sugar, adding eggs one at a time and mixing well after each addition.
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beat in vanilla extract.
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whisk cocoa and boiling water until smooth.
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in seperate bowl combine flour, baking soda, baking powder, and salt.
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add dry ingredients and cocoa mixture alternately and beat until smooth.
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pour batter into 3 greased and floured 9-in. round baking pans. bake at 350 for 25-30 minute until a toothpick comes out clean. cool for 10 minute remove from pans to wire racks.
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filling.
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in a mixing bowl, beat cream powderd sugar and vanilla on high speed until soft peaks form.
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chill until firm.
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frosting.
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in a sauce pan, melt chips and butter over medium heat; stir in cream.
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remove from heat; stir in powderd sugar.
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chill for at least 1 hour or until completely cooled.
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beat on high to achieve fluffy, spreadable consistancy.
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to put it all together, spread half the filling over one cake layer; top with second layer and remaining filling.
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top with third layer; frost top and sides of cake.
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chill for 2 hours before cutting.