I've made brownies many many times. As a general rule, I use a quad for 1 box of brownie mix. Grind up all of the supplies and let it gently simmer into the oil at a fairly low heat. The low heat is key, because you don't want it to burn, as then you'd have oil without thc in it.... Then, just dump all of the oil into the mix. some people strain the buds out, but usually if you grind them first, you won't even notice it in the brownies later on. Then just cook the brownies as normal.