Season chicken breasts on both sides with salt and black pepper.
Heat olive oil in a large skillet over medium-high heat.
Sear the chicken for 5 to 7 minutes per side or until the internal temperature reaches 165 degrees Fahrenheit. Remove chicken and set aside on a plate.
In the same skillet, add minced garlic and sun-dried tomatoes. Sauté for 1 minute until fragrant.
Whisk in chicken broth, heavy cream, parmesan cheese, dried oregano, and red pepper flakes.
Bring the mixture to a gentle simmer and cook for 3 to 5 minutes until the sauce begins to thicken.
Stir in the fresh baby spinach and cook for 1 minute until wilted.
Return the chicken to the skillet and spoon the sauce over the breasts. Serve warm.