Rinse and drain the canned chickpeas thoroughly in a fine-mesh sieve.
Dice the pre-cooked seitan into small, bite-sized cubes and chop the cucumber and parsley.
In a large mixing bowl, combine the cooked quinoa, drained chickpeas, and diced seitan.
Add the cucumber, halved cherry tomatoes, and fresh parsley to the bowl.
Sprinkle the hemp hearts and nutritional yeast evenly over the salad mixture.
In a small jar or bowl, whisk together the lemon juice, red wine vinegar, dried oregano, sea salt, and black pepper.
Pour the dressing over the salad and toss well until all ingredients are thoroughly coated.
Serve immediately at room temperature or chill in the refrigerator for 30 minutes for a more refreshing flavor.