I'm thinking more oil/butter and less water, but I'm not sure of the ratios. I would probably also cook brownies for a shorter amount of time. What determines a cake's fluffiness and a brownie's dense ...
I've got a great brownie recipe that works awesome in a 9x11 pan. The top comes out crunchy, the bottom cake like and the middle nice and fudgy. I figured I would try to make them in a mini-muffin ...