- Zest and juice lemons, mince garlic, and grate parmesan. 
- Heat olive oil in skillet over medium heat until shimmering. 
- Add garlic; cook 30 seconds until fragrant, not browned. 
- Pour in white wine (optional) and let bubble for 1 minute. 
- Add heavy cream and bring to a gentle simmer. 
- Stir in lemon zest and juice gradually. 
- Reduce heat; whisk in parmesan cheese in small handfuls. 
- Stir until smooth and creamy; season with salt, pepper. 
- Add parsley and red pepper flakes. 
- Toss with pasta, chicken, or vegetables. Serve hot.