hello, you wealth of helpful and resourceful bakers, you.
i just started a job (i really mean like just a few days ago) as a baker for an all natural cafe. the owner is a nutritionist so her part of the job is to tell me what she wants and i'm to figure out how to do it. we're going to be baking to accommodate some food allergies, vegans, diabetics, and i'm starting out with gluten free muffins and using spelt flour. i have never ever baked with any gluten free flour! and though it's a lovely environment where they understand that and let me experiment, i could use a little help. are there any tips or crucial knowledge that i should have about making gluten free baked goods?
a little more importantly,
and separately, does anyone have any tips on baking with spelt flour? in addition to the gf baking, we're also making muffins with spelt flour instead of regular wheat flour. i am not trying to make gluten free food with spelt, to clear up some confusion (sorry). in my experience so far (which is three batches of unsatisfactory muffins), spelt hates to be baked with! i know it has an imbalance of gliadine and glutanine, and the lack of glutanine means the muffins do not hold their shape. i've never baked with spelt either, and my attempts to alter the recipes i've been given haven't been super productive. all my muffins have looked like this:

they spread on the sides, cave in the center, and become crust-like on the tops. the recipes i'm using have a lot of oil in them (which i'm working on tweaking) and that makes me think it might be part of the problem, but i do know the spreading and caving is the work of little glutanine. but i don't know how to fix it yet. i'm not sure my boss' stance of mixing spelt with whole wheat flour but i've read that helps. does anybody have any other suggestions?
thanks so much, bakebakebakers! honestly any knowledge thrown my way is super helpful and super appreciated.
<3
EDIT: dudes and ladies! i understand your concern about the environment i am producing goods i'm calling "gluten free" in, and that's justified. it may not look particularly great on me to say i'm not fully aware of the kitchen i'm working in, but hey. i'm not fully aware of the kitchen i'm working in; i started this job at the beginning of this week. i don't want people thinking there should be alarm because i'm sure my boss has worked hard to create a safe food environment. that said! i'm not meaning to sound accusing and i respect and appreciate everything that's been said in the comments so far and actually i found out some stuff i didn't know. i will do my best to accommodate gluten allergies by being as thorough as i can, but all i can be responsible for is me. thanks. :)