01 - Season the chicken breasts with salt and pepper on both sides.
02 - Heat olive oil in a large skillet over medium-high heat. Add chicken and sear for 5-6 minutes per side until golden and cooked through. Remove chicken to a plate and set aside.
03 - In the same skillet, add the chopped onion and sauté for 2-3 minutes until translucent. Add minced garlic and cook for 1 minute until fragrant.
04 - Stir in sundried tomatoes and cook for 1 minute.
05 - Pour in the chicken broth and scrape up any browned bits from the bottom of the pan. Reduce heat to medium.
06 - Add heavy cream, Parmesan cheese, Italian seasoning, and crushed red pepper flakes. Stir until the sauce is smooth and begins to thicken, about 2-3 minutes.
07 - Add spinach and cook for 2 minutes until wilted.
08 - Return the chicken breasts to the skillet, nestling them into the sauce. Simmer for 3-4 minutes to heat through and allow flavors to meld.
09 - Garnish with chopped parsley and serve immediately.