I just made some pumpkin muffins, but I ran out of cupcake liners, and I was wondering can I use the mix (I haven’t cooked the whole batch yet) in a bread pan? Will it just come out as pumpkin bread, or is the mix different?

I have Betty Crocker ultimate fudge brownie mix that I want to use a muffin pan for. Has anyone tried this? I would use cupcake liners in the pan.