Blend olive oil, sugar, orange juice, poppy seeds, minced onion, Dijon mustard, orange zest, and salt in a blender until smooth.
Toss salad greens, green onions, avocado, green apple, goat cheese, cranberries, golden raisins, mandarin oranges, and walnuts together in a large mixing bowl. Drizzle dressing over the salad; toss to coat.
