01 - Season chicken breasts generously on both sides with kosher salt and black pepper, ensuring even coverage.
02 - Heat olive oil in a skillet over medium heat. Sear chicken breasts for 2 to 3 minutes per side until lightly golden. This step develops flavor and texture.
03 - Transfer seared chicken breasts to the slow cooker, arranging them in a single layer for even cooking.
04 - In a 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 creamy sauce mixture evenly over the chicken. Sprinkle grated Parmesan cheese across the top.
06 - Cover and cook on low setting for 3 to 4 hours, until chicken reaches an internal temperature of 165°F and is tender throughout.
07 - Remove chicken from the slow cooker. Stir the sauce to emulsify, then return chicken to coat thoroughly. Garnish with fresh basil slices and additional black pepper before serving.