Cook pasta in salted water according to package instructions, then drain and set aside.

Heat olive oil in a skillet, cook sliced chicken until fully done and lightly golden.

Remove chicken, then sauté minced garlic in the same skillet until fragrant.

Add heavy cream, milk, and parmesan cheese, stirring until smooth and slightly thickened.

Return chicken to skillet, mix well, then add cooked pasta and toss until coated.

Add spinach if using, cook briefly, then serve warm.