Coat the corn with olive oil. Season with Tajin. Grill the corn over high heat until grill marks form, about 2-3 minutes per side. Remove and let cool. Once cooled, cut the kernels from the ear.
To a bowl, add the corn, cream cheese, mayo, chili powder, and half each of the bacon, cilantro, and cotija. Stir well to combine.
Spoon the mixture evenly into each jalapeno half.
Cook at 400°F for 10 minutes.
Top each with crumbled bacon, cilantro, and cotija. Season with Tajin.