Midwest has a Bourbon Barrel ale that we've made a couple of times. It came out really good. It give you the essence of the liquor without the burn. We soaked the oak for a couple weeks and tossed the cubes and liquid in the carboy.
Copied from Midwest Supplies product description:
Bourbon Barrel Old Ale. Simulate the Bourbon cask experience without having to make 55 gallons. This British style refers in part to the strength of the beer as well as the maturation period associated with it. Vanilla, oak and bourbon notes dominate the flavor profile. Recommended aging time 6-12 months. Our ingredients for this recipe include: 6 lbs. Amber liquid malt extract, 3.3 lbs. Gold liquid malt extract, 8 oz. Brown Malt, 8 oz. Crystal 50-60°L, 8 oz. Wheat, 4 oz. Aromatic, 4 oz. Chocolate specialty grains, 1 oz. Northern Brewer, 2 oz. Glacier, 2 oz. Tradition hops, priming sugar, 2 oz. American Oak Cubes, muslin bag, and yeast.