Lower heat, push veggies aside, add butter and olive oil, then toss in cooked pasta, chicken, parmesan, lemon juice, and a splash of reserved pasta water. Toss until well combined and silky, adding more water if dry.
Taste and adjust seasoning, then serve topped with extra parmesan, fresh herbs, and a squeeze of lemon.
Notes
Use freshly grated parmesan for best flavor. Feel free to add more herbs or lemon for extra brightness.