Ingredients:
8 lbs Dark LME
18 oz Chocolate Malt
18 oz Caramel Malt 80L
1 oz Northern Brewer hops (7.5% AA) for bittering
1 oz Perle hops (7.2% AA) for aroma
8 oz Ghiradelli unsweetened cocoa (by volume)
2 oz Hazelnut flavoring
California V Ale Yeast (WLP051)

Instructions
Bring two gallons of water to 160*f, turn off the heat, and steep the milled grains for 20+ minutes. Remove the grains and discard. Bring the grain tea to a boil, turn off the heat, and stir in the malt extract until completely dissolved. Return to a boil and add the bittering hops. Boil for 60 minutes, adding the chocolate powder five minutes before the end of boil and the aroma hops at flame out. Cool to 70*f, top off to five gallons, and pitch yeast. (I carefully poured the hot wort onto two gallons of ice that I'd previously frozen, which brought the temperature down below 70*f almost instantaneously; watch for splashes!).

Ferment at 70-72*f for 10-14 days, until the gravity readings have stopped dropping. Transfer to a keg or your bottling bucket and add the hazelnut extract. Let it condition for two or three weeks and you should have some very tasty brew on your hands!

The Result
I haven't plugged this recipe into a brewing program but my batch ended up being 5.2% ABV. It turned out very creamy and smooth, with good but not overpowering elements of chocolate and hazelnut to go along with the caramel malts. It was definitely a crowd pleaser. I'll definitely be brewing this one again.

Here's the all-grain version. Round as you see fit. Any American or British yeast can be used to good effect. I reduced the amount of extract from 2 oz to 1 oz since the more I use it, the more sensitive I get to it.
BeerSmith Recipe Printout - www.beersmith.com
Recipe: Choconut Porter All Grain
Style: Robust Porter
TYPE: All Grain

Recipe Specifications
--------------------------
Batch Size: 5.00 gal
Boil Size: 5.72 gal
Estimated OG: 1.059 SG
Estimated Color: 40.9 SRM
Estimated IBU: 30.8 IBU
Brewhouse Efficiency: 75.0 %
Boil Time: 60 Minutes

Ingredients:
------------
Amount Item Type % or IBU
8.52 lb Pale Malt (2 Row) US (2.0 SRM) Grain 75.1 %
1.41 lb Caramel/Crystal Malt - 80L (80.0 SRM) Grain 12.4 %
1.41 lb Chocolate Malt (350.0 SRM) Grain 12.4 %
1.00 oz Northern Brewer [7.50%] (60 min) Hops 25.4 IBU
1.00 oz Pearle [8.00%] (5 min) Hops 5.4 IBU
1.00 oz Hazelnut Extract (Bottling 5.0 min) Misc
8.00 oz Cocoa, Unsweetened (Boil 5.0 min) Misc
1 Pkgs California Ale V (White Labs #WLP051) Yeast-Ale

Mash Schedule: My Mash
Total Grain Weight: 11.34 lb