Add Ingredients to Slow Cooker: Add the cream of chicken soup, mixed vegetables, chicken bouillon, Cowboy Butter seasoning, garlic powder, onion powder, poultry seasoning, black pepper, and chicken tenderloins to the slow cooker. Stir gently to combine.
Slow Cook: Cover and cook on high for 3–4 hours, until the chicken is tender and cooked through.
Shred the Chicken: Remove the chicken from the slow cooker and shred it using two forks.
Return Chicken to Slow Cooker: Add the shredded chicken back to the slow cooker and stir to combine with the creamy sauce.
Cook the Pasta: While the chicken is shredding, cook the rotini pasta according to package directions until al dente. Drain well.
Finish the Dish: Stir the cooked rotini into the slow cooker and mix until the pasta is fully coated in the creamy sauce.
Serve: Serve warm and enjoy.