I posted awhile ago about diet soda cake. Yesterday I tried it with brownie mix, and it didn't seem to come out as good as the cake did. The mix was very watery, it baked ok although some parts seem less baked than others and the taste of soda is very obvious (more so than the cake where I could taste chocolate and not much soda).
I think I made the mistake of just dumping the whole can of soda in instead of mixing a little at a time to just get the mix wet...? does anyone make brownies this way

? Is there a different ratio of soda to brownie mix since it seems different than the cake mix?