Add potatoes, flour and eggs into a large mixing bowl. Mix until everything is combined and smooth. Stir in cheese and chives.
Grease waffle iron with cooking oil spray and bring to high heat (I used the highest heat level setting on mine). Add 1/2 cup mashed potato batter to the center of the waffle iron and close iron. Cook until waffles are golden brown and slightly crispy. Repeat with remaining batter. If you are making mini waffles, put in 1/4 cup of batter instead of 1/2 cup.
Notes
This recipe uses thick cold mashed potatoes. If you are using thin and creamy mashed potatoes, you should double the amount of flour.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.