Just did one, here's what I used. It's in the bottles now. I'm going to crack one this weekend to see how it is. Gave two bottles to a friend and he couldn't wait. He opened one early and said it was fantastic. Fingers crossed!!
Milk chocolate stout
1 lb Crystal 60
1 lb Flaked Oats
12 oz Roasted Barley
8 oz Chocolate Malt
6lb dark DME
1lb Lactose
1.5 oz Kent Goldings @ 60 min
.5 oz Kent Goldings @ 20 min
8 oz Hershey's unsweetened Cocoa Powder @ 10 min
Irish Ale yeast
4.5oz cocoa nibs soaked in vodka. (secondary)