Final answer:
The recommendation for a qualitative research method to improve community outcomes in health would be phenomenology, as it explores the lived experiences of individuals and is invaluable for understanding complex social health phenomena.
Step-by-step explanation:
When a public health nurse is considering recommendations on how to use evidence-based practice to improve community outcomes, and looking specifically for a qualitative research method, phenomenology should be recommended. Phenomenology is a research approach grounded in the belief that knowledge can be derived from experience, providing an in-depth understanding of people's lived experiences and perceptions. This approach seeks knowledge through the detailed study of individuals' experiences and is beneficial for understanding complex social phenomena from the first-person perspective, making it a valuable method for health sciences where patient and community perspectives are crucial.