01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt and black pepper. Lightly dredge each breast in flour, shaking off excess to ensure even coating.
02 - Heat olive oil in large skillet over medium-high heat until shimmering. Add chicken breasts and sear 4-5 minutes per side until golden brown and internal temperature reaches 165°F. Transfer chicken to plate and tent with foil.
03 - Reduce heat to medium. Add butter and minced garlic to same skillet. Sauté until fragrant, about 1 minute, being careful not to burn garlic.
04 - Stir in sundried tomatoes and cook 1 minute. Pour in chicken broth and bring to simmer, using wooden spoon to scrape up browned bits from bottom of pan.
05 - Add heavy cream and Parmesan cheese. Stir continuously until cheese melts completely and sauce thickens enough to coat back of spoon, about 3-4 minutes.
06 - Add fresh spinach to sauce. Cook 1-2 minutes, stirring gently, until just wilted but still vibrant green.
07 - Return chicken breasts to skillet, spooning sauce generously over top. Simmer 3-4 minutes until chicken is heated through and flavors meld. Garnish with fresh basil if desired and serve immediately.