one of the secrets to making good brownies is to use an ounce of somewhat shitty weed. Obviously you can use better weed, which would just yield better results, however if you use an ounce of shitty weed, its more cost effective. Before using the second step that i'm about to tell you about, make sure you break up the nugs into pieces that are like 1/4 of a gram.
The bests method of making marijuana brownies is to saute your ounce into 2/3 cup of vegetable oil for about half an hour. Make sure you dont burn it or else it will taste/smell like shit. After the oil changes in color to like a brownish, you wanna take it off of heat and strain it through a cheese cloth or one of those handheld strainers into a measuring cup or a bowl. Usually you would want to strain it again, just to make sure that all the gross stuff is out.
After this KEY step, you just replace this as the oil. You resume following the directions on the brownie mix and you're in business. A common misconception is that butter is more effective than oil, however this isnt true becuase butter burns a lot easier, making it harder to do.
When the brownies are ready, make sure you don't eat too many. If you eat more than 1/4 of what you make, that means that there are 7 grams inside you. Don't do that. Even though it can take up to 2 hours to feel it, it doesnt mean its not going to happen. I ate a brownie with about 3 grams in it and i was high for 13 hours. I was equally high after the 3rd hour as i was at the 13th.
Good luck