I add beer in the last week to my secret "meaty finishing mash"
, not sure about the whiskey, but i got the idea from an old and I mean 1700's old "fattening" method i read about. The claim is the bird eats then gets sleepy from the booze and a sleeping bird isn't burning up the energy in its food so it pumps up. I've only done meaties one year so I cant say what the difference is but i knew a pig farmer who said he finished hogs with beer.
I inbibe in a bottle or two of beer during processing 25 campers then finish off with a hot shower and then a mint julep or hot buttered rum, depending on the season.
Brown your chicken and when it is done, deglaze the pan with a bit of brandy. Add a couple of Tablespoons of heavy cream and pour the sauce over the chicken.