01 - Season both sides of the chicken breasts with kosher salt and black pepper.
02 - Heat olive oil in a large skillet over medium-high heat. Sear chicken breasts for 2 to 3 minutes per side until lightly golden for enhanced flavor.
03 - Place the seasoned chicken breasts into the crockpot.
04 - In the same skillet, add minced garlic and sauté for 30 seconds until fragrant. Stir in Italian seasoning, crushed red pepper flakes, and chopped sun-dried tomatoes. Cook for 1 minute.
05 - Add chicken broth and heavy cream to the skillet. Bring to a gentle simmer, then whisk in grated Parmesan cheese until melted and sauce is combined.
06 - Pour the sauce evenly over the chicken in the crockpot.
07 - Cover and cook on low for 6 hours or on high for 3 to 4 hours, until chicken is tender and reaches an internal temperature of 165°F.
08 - Stir fresh basil and parsley into the sauce. Taste and adjust seasoning as needed.
09 - Serve chicken with generous amounts of sauce, garnished with additional basil if desired.