01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, black pepper, and garlic powder, pressing seasoning into meat to adhere.
02 - Heat olive oil and butter in large skillet over medium-high heat until butter foams. Add chicken breasts and sear 5 to 6 minutes per side until golden brown and internal temperature reaches 165°F. Transfer to plate and rest.
03 - Add minced garlic to same skillet and sauté 30 seconds until fragrant, being careful not to burn. Stir in chopped sun-dried tomatoes and cook 1 minute to release oils.
04 - Pour chicken broth into skillet, using wooden spoon to scrape up browned bits from bottom. Let simmer 1 minute to concentrate flavors.
05 - Reduce heat to medium-low. Stir in heavy cream, Parmesan cheese, and Italian seasoning. Simmer 2 to 3 minutes, stirring constantly, until sauce thickens slightly and cheese melts.
06 - Add fresh spinach to sauce, tossing gently to coat. Let wilt about 1 minute until just softened but still vibrant green.
07 - Return chicken breasts to skillet, spooning sauce generously over top. Simmer 3 to 4 minutes until chicken is heated through. Serve immediately, garnished with chopped fresh basil and additional Parmesan if desired.