I wouldn't think you would need more than a gram of hash in a brownie mix. When I make honey oil I end up with about 1 ot 1 1/2 grams of hash per ounce of weed. And I put 1/4 to 1/2 ounce of weed in my brownies depending on how potent I want them. So I would think 1 gram of hash would probably work good.