There is a discussion in the Mechilta here about exactly how the Mahn was prepared. Rebbi Yehoshua holds that the mere thought of baking would miraculously transform the Mahn into a baked preparation, and the thought of cooking would render the Mahn cooked. Rebbi Elazar HaModa'i says that it would taste as if it were prepared the way you wanted, but there was no physical change. (I suppose this is what underlies the machlokes Reb Ami and Reb Asi in Yoma 74b whether the tribulation of the Mahn was not having food in the pantry or not seeing the food you're tasting.)
Two years ago, I posted a discussion about BCI technology, with which a person can control a computer via thought patterns. Absolutely no movement is involved; sensors detect and analyze variations in brain wave activity and the program responds to this variation. Once you can move and click a cursor with brain activity, you can do every single one of the thirty nine melachos of Shabbos without lifting a finger.
BCI stands for brain–computer interface (BCI). Other terms used are mind-machine interface (MMI), and direct neural interface, and brain–machine interface (BMI), For the latest on BCI, go here.
(Please note that this Mechilta is completely incomprehensible- to me- if we're going to read it literally from a halachic standpoint. Even if thought would make it cooked, the thought did not cook it. I'm not talking about the Bishul b'chama/Bishul b'eish issue, I'm talking about no bishul at all happening. It turned it into a food that was identical with something that had been cooked. It was נתהפך to become a thing that is Mevushal, but there is no event of בישול taking place. What we have here is like a thought that takes an object that was in a Reshus Hayachid and makes it re-appear in a Reshus Harabbim. There was no akira, there was no ha'avara, there was no hanacha. Before it was there, now it's here. We have the shiur of a melacha, and we have the effect of a melacha, but the melacha wasn't done. There's a consequence without a sequence. Bishlema by netilas neshama, causing death is the melacha, and however you do it it's assur. Here, it's the act of bishul that is assur and the fact that the food gets cooked is for the chiyuv on a shiur of the melacha. It's like Zorei'ah, planting: the issur is the planting, and the fact that the seed sprouts is just a test of whether your act of planting was a melacha. Here, it's impossible that such a thing would be bishul. Maybe it would be makeh b'patish, but that doesn't make sense either, since it was perfectly good even without the machshava. But I don't care that this is shver. The Achronim see the Mechilta as a raya to this question, so I'm going with that. I guess the problem is not bishul, but Mesaken Manna, like the next source says.)
The Moshav Zkeinim in Bamidbar (11:8) says the following:
Along the same lines, see Reb Akiva Eiger brought in the Shaar Tziyun in 633 sk 14, regarding a too-tall sukkah that has a pile of dirt in middle, and before yomtov you weren't mevateil the dirt, that he is not sure if if it is muttar to be mentally mevateil the dirt to the ground, because it would make the Sukka kasher and therefore be mesaken manna/makeh b'patish. I cannot find this RAE anywhere except this Shaar Tziyun. Anyway, from this RAE is appears that he's mesupak regarding the issue of mesaken manna with machshava.
And the best part- Reb Meir Don Plotzki (Kli Chemda) in Beshalach proposes that there is a difference between Shabbos and Yomtov. On Shabbos, which is an eternal and immutable commemoration of Hashem's Shvisa creating the world through His Machshava, the issur includes melacha that is done with machshava. But Yomtov, whose kedusha is created by Beis Din, by humans, the issur is only on melacha that is done with an act, the human sort of melacha. Wouldn't that be interesting, to be mattir BCI melacha on Yomtov but not on Shabbos?
I found a nice article on this topic. He cites most, if not all, of my references, here. Here's his summation: