Preheat the oven to 200°C (400°F).
Season chicken breasts with salt, pepper, and garlic powder.
Heat olive oil in an oven-safe skillet over medium heat. Sear chicken for 3-4 minutes per side until golden. Remove and set aside.
In the same skillet, add heavy cream, chicken broth, Parmesan, sun-dried tomatoes, spinach, Italian seasoning, and red pepper flakes. Stir until the sauce thickens slightly.
Return chicken to the skillet, spooning sauce over the top.
Bake for 20-25 minutes until the chicken is cooked through.
Let rest for 5 minutes before serving.