Pat the chicken thighs dry with a paper towel and season both sides with salt, pepper, and Italian seasoning.
Sear the Chicken
Heat olive oil in a large skillet over medium-high heat. Sear the chicken for about 5 minutes on each side until golden brown. Remove from the pan and set aside.
Sauté Garlic and Sun-Dried Tomatoes
In the same pan, reduce heat to medium, add butter, and sauté the garlic for about 30 seconds until fragrant. Stir in the sun-dried tomatoes.
Make the Sauce
Pour in the heavy cream and chicken broth, then whisk in the Parmesan cheese. Let it simmer for 2 minutes to thicken slightly. Add red pepper flakes if using.
Add the Spinach
Stir in the spinach and cook until wilted, about 1 minute.
Combine Everything
Return the chicken thighs to the pan, spooning the sauce over them. Let simmer for another 5 minutes until the chicken is cooked through.
Serve and Enjoy
Plate the chicken with extra sauce drizzled on top. Pair it with pasta, mashed potatoes, or crusty bread!