I came onto the Internet hoping to find some definitive tactics for baking herb brownies. After some Google and skimming through this board, I was surprised to see very little accurate information of how to do it. Most articles are into cannabutter or hold ignorant information. So here is how it's done (feel free to sticky).
Grab a box of brownie mix, one that uses oil. The more oil it uses the better. How much herb and what grade is ENTIRELY up to you. ENITRELY. It can be an 8th of krawnick or a zipper of kush. Obviously one batch will be more potent than the other. generally I use a high grade krawnick (hash plant, Ak-47, Juicy fruit, whatever) or just your plain regular krawnick. My goal is usually to put .5 gram in each brownie. If I plan to cut 12 brownies, I will use 6 grams. That is the equation I use but you can choose to put a gram in each, 2 grams, whatever.... If you are using high grade krawnick a half gram in each brownie is a standard dose. Two or three of them will get you quite stoned.
Before mixing the brownie batter you are going to sautee the herb in the vegetable oil. To do this you will use a double broierl- but you don't have one. So grab a very large pan, fill it with water and bring it to a boil. You will then place a second pan within that pan- so the first pan should be broad and able to hold a fair amount of water and another pan. The reason you do this is because directly heating the oil (with just one layer of pan) will destroy the THC. This method cuts that problem out. So the end result is a big pan with boiling water in it, and another pan on top of that with the vegetable oil and the herb in it. The herb should be ground up, as if you were about to roll a blunt. Sautee (stir a little, etc) for about 20 minutes, maybe less. If you see an excessive amount of vapor rising then turn the heat down- make sure the heat is not ever too much. 15 minutes or so is usually good, it is a delicate balance. You want the oil to absorb as much THC as possible without destroying any.
Now take the oil/herb substance and run it through a strainer, dropping it into the brownie batter (all the brownie powder, an egg and whatever). The rest is history. You can add the raw weed from the strainer into the mix if you want- I personally do add about half of it. This will insure you have most of the THC in there and if it is decent weed it will help with the taste, plus it is cool to have some tasty herb in there. It is not necessary, though.
Bake your brownies. The pan size that bakes at a low temperature is best (again, heat fucks up THC), so look at the back of your box for that. If you have any questions or suggestions please bring them up. I have been baking weed brownies since before neanderthals were drawing on walls in caves, and this is the most potent method I have come up with.