Place all the ingredients for the dressing a glass spouted cup (or mason jar) and whisk together. Slice the zucchini halfway through lengthwise, being careful not to pierce through the center. spiralize the zucchinis (if using the Inspiralizer, use blade C) and add to a large bowl. Spiralize half of the red onion (if using the Inspiralizer, use blade A) and save the other half of the onion for another use. Add the spiraled onions into the bowl with the zucchini. Add olives, chickpeas, baby tomatoes and feta cheese into the bowl. Drizzle the salad dressing over the veggies and gently stir everything together.