We've had bean appreciation threads and beans are really awesome. But have you considered onions?
White onions, yellow onions, green onions, red onions, spring onions. They're the humble workhorse of vegetables and we use them for everything. Raw, cooked, fried, pickled. They've been with us forever, we eat them every day.
Just put an onion in the oven, for about 40 minutes. That's it. That's all you need.
More info: https://www.youtube.com/watch?v=xV9spqCzSkQ&t=179s
what temp?
Don't even turn it on, the onions do the work for you.
I don't know, somewhere around 450F seems to work well for me!