yeah, but making the butter stinks, or so sez my gf. just made some yummy cookies yesterday!
but yeah go with the butter. you can make a large batch, and then cook without worrying about the smell. it is much more effective as well, as the butter needs to contact the plant matter to extract the THC, so if you just put it in the batter, it only sees heat for 10 minutes and a fraction of the butter. you'd be better off finding three hours in which you can make butter.