He had a video recently explaining how he came up with the Storms in SLA. Not sure if this is what you're looking for but interesting nonetheless.
https://youtu.be/dWRGPfD1zLI?si=tmNXV49CF38-EGTm
He has noted that themes are important to his writing process, but he doesn't talk about it that much (probably because it's harder to pinpoint and teach than the more technical storytelling mechanics he works with). These are some WOBs though:
[https://wob.coppermind.net/events/239/#e10028](https://wob.coppermind.net/events/239/#e10028)
[https://wob.coppermind.net/events/270/#e7541](https://wob.coppermind.net/events/270/#e7541) (this one has Mistborn Era 1 spoilers)
[https://wob.coppermind.net/events/499/#e15761](https://wob.coppermind.net/events/499/#e15761)
[https://wob.coppermind.net/events/361/#e11007](https://wob.coppermind.net/events/361/#e11007)
[https://wob.coppermind.net/events/358/#e11101](https://wob.coppermind.net/events/358/#e11101)
I would suggest reading the annotations on Brandon’s website. There are ones for Mistborn Era 1, Elantris, Warbreaker, Alcatraz, and a little bit of Alloy of Law and Way of Kings.
Edit: Forgot the link https://www.brandonsanderson.com/brandon-sanderson-online-library/
He had a video recently explaining how he came up with the Storms in SLA. Not sure if this is what you're looking for but interesting nonetheless. https://youtu.be/dWRGPfD1zLI?si=tmNXV49CF38-EGTm
Yeah that's a great essay but not quite what I'm looking for. Thanks, though!
He has noted that themes are important to his writing process, but he doesn't talk about it that much (probably because it's harder to pinpoint and teach than the more technical storytelling mechanics he works with). These are some WOBs though: [https://wob.coppermind.net/events/239/#e10028](https://wob.coppermind.net/events/239/#e10028) [https://wob.coppermind.net/events/270/#e7541](https://wob.coppermind.net/events/270/#e7541) (this one has Mistborn Era 1 spoilers) [https://wob.coppermind.net/events/499/#e15761](https://wob.coppermind.net/events/499/#e15761) [https://wob.coppermind.net/events/361/#e11007](https://wob.coppermind.net/events/361/#e11007) [https://wob.coppermind.net/events/358/#e11101](https://wob.coppermind.net/events/358/#e11101)
I would suggest reading the annotations on Brandon’s website. There are ones for Mistborn Era 1, Elantris, Warbreaker, Alcatraz, and a little bit of Alloy of Law and Way of Kings. Edit: Forgot the link https://www.brandonsanderson.com/brandon-sanderson-online-library/