Prepare the slow cooker by adding chicken thighs.
Add the corn, bell pepper, onion, and garlic on top of the chicken.
Sprinkle the chili powder and smoked paprika evenly over the ingredients.
Drizzle the mayonnaise over the mixture and season with salt and pepper.
Cover and cook on low for 6-8 hours or high for 3-4 hours.
Once cooked, shred the chicken inside the cooker with two forks.
Add the crumbled cotija cheese, chopped cilantro, and lime juice, stirring gently.
Serve warm, garnished with additional cilantro and cheese if desired.