This thread did inspire me to read some comics, so I decided on the My Little Pony & Transformers crossover from IDW comics!
It was an 8 issue miniseries, released in two parts back in 2020 & 2021.
Part 1: "Friendship in Disguise" sees the Autobots being sent to Equestria via teleportation magic and teaming up with the MLP cast to fight the Decepticons, who had partnered with the MLP villain; Queen Chrysalis.
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Part 2: "The Magic of Cybertron" was the inverse. Set after part 1, the MLP cast visit Cybertron in the hopes of stopping the MLP villain King Sombra from taking over with his mind control magic.
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Not the most complex of stories, but it is fun. It's fun to see the interactions between the different franchises, as well as the few meta jokes that the writers throw in now and then (The literal 2nd panel of the first issue makes fun of people taking continuity too seriously with these kinds of throwaway crossovers)
Plus, the art is just really cool to look at!