This homebrew-scaled recipe from Abnormal Beer Co's (San Diego, California) is the imperial stout base commonly used before it gets treatments such as vanilla, coffee, coconut, and more.
Batch size: 5 gallons (19 liters)
Brewhouse efficiency: 59%
13 lb (5.9 kg) 2-row malt
2 lb (907 g) chocolate malt
1.75 lb (794 g) flaked oats
1 lb (454 g) Crystal 60L
1 lb (454 g) Caramunich
1 lb (454 g) Patagonia Black Pearl
0.75 lb (340 g) roasted barley
2 lb (907 g) light dry malt extract (DME)
2 lb ( 907 g) Malto Dextrin
0.5 lb (227 g) rice hulls
2.3 oz (65 g) Nugget [15.5% AA] at 60 minutes
2 packets Safale US-05
Use 1 quart (946 ml) of water per pound (454 g) of malt. Add all the base grains at the bottom of the lauter/mash tun, then the specialty grains on top of that. It helps with lautering. Mash at 148°F (64°C) for 4 hours. Boil for 60 minutes following the hops schedule. Chill the wort, and pitch the yeast. Aerate for 30–60 seconds on the first day of fermentation to help bring down the final gravity a bit. Ferment at 66°F (19°C) and on day 5 or when fermentation begins to slow down, raise the temperature to 70°F (21°C).