Season the Chicken: In a small bowl, whisk together the chili powder, cumin, smoked paprika, salt, and pepper. Rub the seasoning all over the chicken breasts.
Layer the Cooker: Place the seasoned chicken at the bottom of the slow cooker. Pour the corn and garlic over the top. Place the block of cream cheese (or dollops of Greek yogurt) on top of the corn.
Slow Cook: Cover and cook on HIGH for 3–4 hours or on LOW for 6–7 hours.
Shred the Chicken: Remove the cooked chicken to a cutting board and shred using two forks.
Sauce it Up: Stir the melted cream cheese and corn together in the slow cooker to create a uniform, creamy sauce. Add the shredded chicken back into the sauce.
Garnish and Serve: Stir in the fresh lime juice. Portion into bowls and top with crumbled feta or cotija cheese, fresh cilantro, and sliced jalapeños.