Set waffle iron to medium-high and preheat. Reserve half of parsley for garnishing.
Combine all ingredients (including the remaining parsley) in a large bowl. Stir until well mixed.
Mist the waffle iron with non-stick cooking spray.
Pour about 1/2 cup of the hash brown mixture onto the hot waffle iron. Use a spatula to spread the mixture into an even layer. Cook until golden and cooked through, about 3-5 minutes. Be aware the hash browns will release steam as they cook.
Remove from waffle iron and place cooked hash brown waffles on oven rack in a 200°F preheated oven until ready to serve. This will help keep them crisp and hot.
Sprinkle with reserved fresh parsley. Serve and enjoy!