Add the chicken, chicken broth, cream cheese, corn, and seasonings to a crockpot. Cook on HIGH for 3–4 hours or LOW for 6–7 hours.
Cook the pasta according to package directions.
Shred the chicken, then stir in the Mexican cheese until melted.
Add the cooked pasta and mix until creamy, adding pasta water if needed.
Divide into 8 servings (about 2 cups each). Top with feta and cilantro.
Refrigerate for up to 5 days or freeze for up to 3 months.
