I have seen post here before about people doing it with success. Cook for a longer period of time and at a lower temp to keep from baking the thc out of the cookie. there is already some type of fat (oil or butter) in the mix.

How much you eat will depend on the quality of the weed you have and the quality of the buzz you are hoping to achieve. You Might go with a couple of bowls and eat the cookies on a very empty stomach.