I made butter with an ounce of mids once. I ended up making cookies out of the butter, which turned out great. They were chocolate chip cookies, but had a taste of MJ to them, not too strong of a taste, but not a weak taste either.
The weed I used wasnt all that, so it took 2-3 cookies to really feel it, but the high creeped up on me after about 45 minutes to an hour, and lasted longer then a smoked high.

I would LOVE to try it with some high test weed though. Just dont have the extra herbs yet