Heat oil in a large pot or deep skillet over medium-high heat. Season chicken with salt and pepper; cook 5-6 minutes until golden and cooked through. Remove; set aside.
Sauté garlic in same pot 30 seconds until fragrant.
Add broth, cream, and lemon juice; bring to a boil.
Add pasta; stir well. Reduce to medium; cook 12-15 minutes, stirring occasionally, until pasta is tender and sauce thickens.
Return chicken with spinach, lemon zest, and Parmesan. Stir until spinach wilts and everything combines.
Adjust seasoning; garnish with optional basil and serve hot.