01 - Preheat oven to 375°F. Grease an 8x8 inch baking dish with olive oil or non-stick spray.
02 - Rinse quinoa under cold water. Combine quinoa and water in saucepan, bring to boil, then reduce heat, cover and simmer 12-15 minutes until water is absorbed and quinoa is fluffy. Set aside to cool.
03 - Heat olive oil in skillet over medium heat. Add onion and cook 2-3 minutes until softened. Add garlic and cook 1 minute.
04 - Add spinach to skillet and cook, stirring, for 2-3 minutes until wilted. Remove from heat.
05 - Whisk together eggs, milk, salt, pepper, and nutmeg in large bowl. Stir in cooked quinoa, spinach mixture, parsley, and half the cheese until well combined.
06 - Pour mixture into prepared baking dish. Sprinkle remaining cheese evenly on top.
07 - Bake 25-30 minutes until center is set and top is golden brown.
08 - Let cool 5 minutes before slicing. Garnish with extra parsley if desired. Serve warm.