Season both sides of the chicken with salt and pepper.
Heat olive oil in a large skillet over medium-high heat. Sear chicken breasts 4–5 minutes per side until golden and cooked through. Remove and set aside.
In the same skillet, reduce heat to medium. Add minced garlic and red pepper flakes (if using), sauté for 30 seconds.
Pour in chicken broth and stir to deglaze, scraping any browned bits from the bottom.
Stir in heavy cream, parmesan cheese, sun-dried tomatoes, and oregano. Let simmer for 2–3 minutes until slightly thickened.
Return the chicken to the pan, spoon sauce over the top, and simmer on low for 5–7 minutes until everything is heated through and well coated.
Garnish with fresh basil or parsley before serving.