01 - Pat chicken breasts completely dry with paper towels. Season both sides generously with salt and black pepper. Dredge each piece lightly in flour, shaking off excess to ensure even coating.
02 - Heat olive oil and butter in a large skillet over medium-high heat until butter foams. 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 cover loosely with foil.
03 - Reduce heat to medium. Add minced garlic to the same skillet and sauté for 1 minute until fragrant, being careful not to burn. Pour in chicken broth and use a wooden spoon to scrape up browned bits from the bottom. Simmer for 2 minutes to reduce slightly.
04 - Stir in heavy cream, lemon zest, and lemon juice. Bring to a gentle simmer, then gradually whisk in Parmesan cheese until completely melted and smooth. Continue cooking for 2–3 minutes until sauce thickens enough to coat the back of a spoon.
05 - Return chicken to the skillet, spooning sauce generously over each piece. Simmer for 3–4 minutes until chicken is heated through. Sprinkle with fresh parsley and crushed red pepper flakes. Serve immediately over pasta, rice, or with steamed vegetables, garnished with additional Parmesan and parsley.