01 - Generously season both sides of each chicken breast with kosher salt and black pepper, ensuring even coverage for maximum flavor penetration.
02 - Heat olive oil in a skillet over medium heat. Sear seasoned chicken breasts for 2 to 3 minutes per side until a golden-brown crust forms. This step enhances flavor though it remains optional.
03 - Arrange seared chicken breasts in the bottom of the slow cooker, spacing them evenly to ensure uniform cooking.
04 - In a medium mixing bowl, whisk together minced garlic, dried oregano, dried thyme, crushed red pepper flakes, sliced sun-dried tomatoes, chicken broth, and heavy cream until thoroughly combined.
05 - Pour the prepared sauce mixture evenly over the chicken breasts. Sprinkle grated Parmesan cheese across the top layer.
06 - Cover the slow cooker with its lid. Cook on low heat setting for 3 to 4 hours, or until chicken reaches an internal temperature of 165°F and becomes tender enough to shred easily with a fork.
07 - Remove cooked chicken from the slow cooker and set aside temporarily. Stir the remaining sauce in the cooker to emulsify any separated cream and incorporate the Parmesan. Return chicken to the pot, turning to coat thoroughly in the sauce.
08 - Transfer chicken and sauce to a serving platter. Scatter fresh basil slices over the top and finish with additional freshly ground black pepper. Serve immediately while hot.