In a large bowl, combine the romaine, chicken, one-half each of the feta and pumpkin seeds, the tomatoes, onions and avocado. Add 1/3 cup of the dressing and toss gently to combine. Taste salad, adding additional dressing as desired and seasoning to taste. Divide salad among 4 plates, topping each with remaining cheese and pumpkin seeds. Serve immediately.
Avocado Dressing: In the bowl of a blender, combine the lime juice, vinegar, garlic, cilantro, green onion, salt, cayenne pepper and avocado and blend.
With the blender running, slowly add the oils to form a thick, creamy dressing. Taste and adjust the flavorings and seasoning if desired. This makes a scant 2 cups avocado dressing, which will keep, covered and refrigerated, up to three days.