01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt and black pepper. Lightly coat each breast in flour, shaking off excess to ensure even cooking.
02 - Heat olive oil in a large skillet over medium-high heat until shimmering. Add chicken breasts and sear for 4–5 minutes per side until golden brown and internal temperature reaches 165°F. Transfer to a plate and tent with foil.
03 - Reduce heat to medium. Add butter to the skillet and let it melt. Add minced garlic and sauté until fragrant, about 1 minute, being careful not to burn.
04 - Stir in sliced sundried tomatoes and cook for 1 minute to release their flavors.
05 - Pour in chicken broth and bring to a gentle simmer, using a wooden spoon to scrape up any browned bits from the bottom of the pan for added depth.
06 - Add heavy cream and grated Parmesan cheese. Stir continuously until cheese melts completely and sauce thickens slightly, about 3–4 minutes.
07 - Add fresh baby spinach to the sauce, tossing gently until just wilted but still vibrant, about 1–2 minutes.
08 - Return chicken breasts to the skillet, spooning sauce generously over the top. Simmer for 3–4 minutes to heat through. Garnish with chopped fresh basil if desired and serve immediately.