1. Rinse quinoa for about 2-3 minutes under water in a large bowl using your hands to remove the bitter saponins.
2. Fill a medium pot with water, add quinoa and a sprinkle of salt to taste. Bring quinoa and water a boil, then reduce the heat to low and cover. Simmer covered 15 minutes.
3. Remove the pot from heat, but keep it covered for an additional 5 minutes without lifting the lid. After 5 minutes, fluff quinoa with a fork and transfer to a large mixing bowl to cool.
4. Add the cucumber, olives, spinach, and feta cheese. Drizzle olive oil and sprinkle salt and pepper. Stir to combine ingredients.
5. Optional: Add more olive oil if salad is too dry - add more salt and pepper for taste.
