Place the chicken breasts at the bottom of the slow cooker in a single layer.
In a mixing bowl, combine the heavy cream, chopped sun-dried tomatoes, chicken broth, grated Parmesan cheese, minced garlic, Italian seasoning, salt, and black pepper. Mix well until combined.
Pour the creamy mixture over the chicken in the slow cooker, ensuring that the chicken is covered.
Cover the slow cooker and cook on low for 4 hours or until the chicken is cooked through and tender.
Once cooked, carefully remove the chicken breasts and place them on a serving platter.
Stir the sauce in the slow cooker to ensure it is well combined.
Spoon the sauce over the chicken breasts and garnish with chopped fresh basil.
Serve hot with your choice of pasta, rice, or crusty bread.