Preheat the oven to 325 degrees F, before getting out as much peanut butter as you wish to make into edibles. As has been said, 2 grams of ground bud for every 1/4 cup of PB seems to be about right. Place the PB and weed in a Pyrex (or other glass) baking dish and mix thoroughly. Spread evenly and cover the dish with tin foil. Place the mixture in the oven for 22 to 24 minutes. It's best to eat right then, but can be stored and resealed for later use in mason jars in the refrigerator.