Never used it, what's the instructions on the packet for mixing it? I guess you add water and stir.
Presumably multiply the amount of water needed for one packet by the number you are using and keep stirring with a big spoon or whatever while you mix it, until it's a nice consistency for messing up
When I've used it before, use warm/hot water which will help break down the powder. Then stir and mix it by clenching it in your fists and crushing it. You'll need to do this for a good few minutes to get rid of all the lumps out of it that will cause problems!
You'll want to start doing that as soon as the water hits the powder. More water = thinner cake batter. It might be worth sacrificing a couple of packets to test out different consistencies!
That'll ensure you get a fabulous consistency, without wasting any of your precious packets. Treat it as an investment in WAM equipment: you'll be able to use it again and again to create some epic goo for pouring, filling, dunking - whatever your preference.
And yes - it's perfect too for making up a flour/water mix that WON'T ruin your hair (ask me for the recipe )
I've used a tool that is used to mix floor cement. The tool is placed and tightened in a hand drill (cordless or otherwise). The other end has spiral wings that drops into whatever is being mixed ( in your case gloppy brownie batter, sounds awesome). It will mix it up quickly. I've also used milk instead of water oh and don't forget the eggs!
I have a mixer. Will have a go later. Might add a little oil too
Rachel x
Just follow the ratios if there are any. Usually boxes of batter include the amount of water and vegetable oil per batch, then you can make it thicker/thinner depending on your preferences... Enjoy!