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For bottom Layer: Melt unsalted butter, sugar and cocoa in top of a double boiler. Add egg and stir to cook and thicken. Remove from heat. Stir in crumbs, nuts and coconut. Press firmly into an ungreased 8 by 8 inch pan.
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For Middle Layer: Cream butter, cream, peanut butter, pudding powder, and icing sugar together well. Beat until light in color. Add the Nutella and swirl a bit with a knife. Do not over mix. Spread over bottom layer.
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For Top Layer: Melt chocolate and unsalted butter over low heat. Cool. Once cool, pour over middle layer and sprinkle with additional chopped walnuts. Chill until firm. If you have a hard time cutting these, try dipping a knife into very hot water and then cutting. The knife will slide right through the bars.