Place chicken, broth, 1/4 cup buffalo sauce, and seasonings in slow cooker.
Top with cream cheese and shredded cheese.
Cover and cook on high for 4 hours or low for 8 hours.
When chicken is fully cooked, remove it from slow cooker and shred with two forks in separate bowl.
Add remaining 1/4 cup of buffalo sauce to chicken and toss to coat. Set chicken aside.
Whisk together cornstarch and water and add mixture to slow cooker.
In slow cooker, use a whisk to stir melted cheese and softened cream cheese (added in step 2) until all ingredients are combined and smooth with no lumps.
Break noodles in half and place in slow cooker.
Top noodles with shredded chicken and cover.
Turn slow cooker on high for an additional 30-60 minutes until noodles are fully cooked. Stir noodles 3-4 times during cooking with tongs or a large fork.
If noodles are not done after 30-60 minutes, add extra broth or water, 1/4 cup at a time or as needed.
Optional: Garnish pasta with fresh cilantro and serve immediately.