Start by cooking the quinoa. In a medium pot, combine the rinsed quinoa and water or vegetable broth. Bring it to a boil, then reduce the heat to low, cover, and simmer for about 15 minutes. You'll know it's done when the water is absorbed and the grains appear fluffy.

While the quinoa cooks, prepare your other ingredients. Dice your apple and chop the walnuts if you're using them. Once the quinoa has cooled slightly, transfer it to a large mixing bowl.

Next, add the apples, cranberries, walnuts, feta cheese, and parsley to the quinoa. Drizzle with lemon juice and olive oil, then toss everything together until well combined. Season with salt and pepper to taste.

This dish is vibrant and ready to serve! You can enjoy it right away, but letting it chill in the fridge for about 30 minutes can deepen the flavors.