In a large bowl, combine the cooked orzo with 2 cups of pre-washed baby spinach, ½ cup of oil-packed sun-dried tomato halves (drained), 3 tablespoons of red onion (chopped), 3 tablespoons of Kalamata olives (pitted and chopped), 1 jar of marinated artichoke hearts (undrained) and a pinch each of salt and pepper. Give the mixture a good stir until everything is evenly combined. Lastly, fold in ¾ cup (3 ounces) of feta cheese into the salad and mix gently.