Place chicken in slow cooker
Sprinkle with ranch dressing mix and top with 1/2 cup barbecue sauce
Pour broth into slow cooker and give it a little stir to combine everything
Cover and cook on low for 6-8 hours or high for 3-4 until chicken is fully cooked
Remove chicken to separate bowl and shred using 2 forks, toss with remaining 1/4 cup barbecue sauce
Whisk cornstarch into liquid in the slow cooker
Add cream cheese and cheese and continue whisking until smooth
Stir in uncooked pasta noodles and top with chicken
Cover and return slow cooker to high for 30-60 minutes until pasta fully cooked, stirring 2-3 times
Add additional liquid 1/4 cup at a time if needed for pasta to fully cook
Serve pasta immediately topped with cilantro, onions and additional sauce or as desired