Place olive oil in a large skillet over medium-high heat.Season chicken with lemon pepper.
Add chicken to skillet and cook 4 to 5 minutes per side, or until cooked through.Remove chicken and set aside.
Add onion to skillet and cook for about 3 minutes to soften.
Add garlic and cook 1 more minute.
Add chicken broth and scrape up any browned bits from the bottom of the skillet.
Add heavy cream and bring to a simmer for 1 minute.Add Parmesan and stir until melted.
Add sun-dried tomatoes, Italian seasoning, and garlic powder.Stir in spinach. Cook and stir until spinach is wilted.Season to taste with salt and pepper.
