In a small bowl, mix Italian seasoning, garlic powder, onion powder, salt, and black pepper.
Carefully fillet each chicken breast into two thinner cutlets. Season both sides evenly.
Heat olive oil in a large skillet over medium heat. Add chicken and cook about 4 minutes per side until golden brown and fully cooked. Remove and set aside.
In the same skillet, add butter and minced garlic. Sauté for 1 minute until fragrant.
Pour in chicken broth, then stir in Dijon mustard and Worcestershire sauce. Scrape up browned bits from the pan for extra flavor.
Add heavy cream and parmesan cheese. Let the sauce simmer for about 5 minutes until slightly thickened.
Stir in fresh spinach and allow it to wilt into the sauce.
Return the chicken to the skillet and spoon the sauce over the top. Simmer briefly until heated through. Serve warm.