1. Melt butter in a large saucepan over medium heat.
2. Add onion; cook and stir 3 minutes.
3. Add water and potatoes; bring to a boil.
4. Reduce heat; cover and simmer 5 minutes or until potatoes are tender.
5. Stir the milk into the gravy mix until smooth.
6. Stir into saucepan.
7. Add turkey, corn and sage; bring to a boil.
8. Reduce heat; cover and simmer for 10 minutes, stirring occasionally.
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