Prep the Chicken: Season the chicken breasts with salt and pepper on both sides.
Sear the Chicken: In a large skillet, heat olive oil over medium-high heat. Add the chicken breasts and sear for 4-5 minutes on each side until golden brown. Remove chicken from the skillet and set aside.
Make the Sauce: In the same skillet, lower the heat and add the butter. Once melted, sauté the garlic for 1-2 minutes until fragrant. Pour in the chicken broth and scrape the bottom of the pan to release the browned bits. Stir in heavy cream, Parmesan cheese, sun-dried tomatoes, oregano, and red pepper flakes.
Simmer: Bring the sauce to a simmer, then add the seared chicken back into the skillet. Cook for another 10-12 minutes, or until the chicken is cooked through (internal temperature should reach 165°F/75°C).
Garnish and Serve: Remove from heat and garnish with fresh basil or parsley.