Season the chicken breasts with salt and pepper on both sides.
In a large skillet, heat the olive oil over medium-high heat. Add the chicken breasts and cook for about 5-7 minutes on each side, or until golden brown and cooked through. Remove the chicken from the skillet and set aside.
In the same skillet, add the minced garlic and sauté for about 30 seconds until fragrant.
Pour in the heavy cream and chicken broth, stirring to combine. Bring the mixture to a simmer.
Add the spinach, sun-dried tomatoes, Parmesan cheese, and Italian seasoning to the skillet. Stir until the spinach wilts and the sauce thickens slightly, about 3-4 minutes.
Return the cooked chicken to the skillet, spooning the sauce over the top. Cook for an additional 2-3 minutes to heat through.
Garnish with fresh basil if desired and serve immediately.