01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, black pepper, and garlic powder, pressing the seasoning into the meat.
02 - Heat olive oil and butter in a large skillet over medium-high heat until shimmering. Add chicken breasts and sear for 5 to 6 minutes per side until golden brown and cooked through. Transfer to a plate and tent loosely with foil.
03 - Add minced garlic to the same skillet and sauté for 30 seconds until fragrant, being careful not to burn. Stir in chopped sun-dried tomatoes and cook for 1 minute.
04 - Pour in chicken broth, using a wooden spoon to scrape up any browned bits from the bottom of the pan. Let simmer for 1 minute to concentrate flavors.
05 - Reduce heat to medium-low. Stir in heavy cream, Parmesan cheese, and Italian seasoning. Simmer for 2 to 3 minutes, stirring constantly, until sauce is smooth and slightly thickened.
06 - Add fresh spinach to the sauce, stirring gently until wilted, about 1 minute. The spinach should be bright green and tender.
07 - Return chicken breasts to the skillet, spooning the sauce generously over the top. Simmer for 3 to 4 minutes until chicken is heated through. Serve hot, garnished with chopped fresh basil and additional Parmesan cheese.