Season the chicken thighs with salt, pepper, and Italian seasoning. Heat 2 tablespoons of olive oil in your skillet, then sear the chicken until golden brown on both sides. Set aside while you prepare the veggies.
Add the remaining olive oil, chopped onion, and minced garlic to the skillet. Sauté for a few minutes until fragrant and the onions turn translucent. Then stir in the chopped sun-dried tomatoes.
Pour in the chicken broth and add the orzo. Let it simmer, stirring occasionally until the pasta is tender and creamy. Stir in the spinach, heavy cream, and Parmesan cheese until everything is well combined.
Return the seared chicken to the skillet, spooning the sauce over the top. Let it simmer for another 3-5 minutes so the flavors meld. Serve hot, garnished with extra Parmesan or fresh herbs.