Begin by placing the chicken breasts in a single layer at the bottom of the crockpot.
In a mixing bowl, combine the heavy cream, chicken broth, grated Parmesan cheese, minced garlic, Italian seasoning, onion powder, and a pinch of salt and pepper. Whisk everything together until the mixture is smooth and well incorporated.
Pour this creamy sauce over the chicken in the crockpot, ensuring that each piece of chicken is thoroughly coated with the mixture.
Secure the lid on the crockpot and set it to cook on low heat for 4 to 6 hours, or until the chicken is fully cooked and tender.
Approximately 30 minutes before serving, break the fettuccine into halves and gently add it to the crockpot. Give it a gentle stir to ensure the pasta is submerged in the creamy sauce.
Continue to cook on low for the remaining 30 minutes, allowing the fettuccine to absorb the flavors and achieve an al dente texture.
Once cooking is complete, use two forks to shred the chicken directly in the crockpot. Stir well to combine the shredded chicken with the pasta and sauce, creating a creamy, unified dish.
Taste the dish and adjust the seasoning with additional salt and pepper if needed.
Notes
For an elegant serving, garnish with freshly chopped parsley and extra Parmesan cheese.