I judged Specialty beers at the San Diego fair last year and we had a Penut butter stout win the category. I judged it with a brewer at Coronado brewing company, he said he thinks the best way to get a good penut butter taste is to use penut butter captain crunch cereal in the mash.
You guys/girls finally got me to register, I've been lurking for years and stumbled on this post! I actually brewed the stout Bsquared is talking about with a friend. I provided the recipe, he chose the yeast and cereal and we brewed it on his equipment. Felt pretty awesome to snag that blue ribbon at the fair!
Recipe below:
5 gallons All Grain
Grain
17 lbs 2-row
12 oz US Chocolate
10 oz Roasted barley
8 oz Black Malt
1 lb Crystal 80
8 oz Victory
Hops
2 oz Clusters 7.6% @ 60 min
.5 oz Centennial 10.3% @ 45 min
.5 oz Northern brewer 9.6% @ 45 min
1 oz Liberty 4.3% @ 2 min
Yeast used was WLP022 Essex Ale (Platinum Strain)
I didn't keep very good notes on the mash temp but I believe it was 149-150 for 60 mins and I believe the boil was 60 min.
After 14 days in the primary it was racked to secondary and an entire box of peanut butter toast crunch was added and left to sit for 5 days. After sampling the beer we weren't happy with the peanut butter flavor so we added an entire box of Reeses peanut butter cup cereal for another 5 days which did the trick.
The funny thing is that I've had people taste this beer and tell me they get absolutely no peanut butter flavor from it while others love it and can definitely taste it.
I brewed it again this weekend but added 2 lbs of flaked oats and I used WLP001 CA Ale yeast since Essex isn't available. I'll post how it came out in a month or so when it's ready.