Heat dressing in electric pressure cooker using SAUTÉ setting. Add onions, garlic and ginger; cook 2 min., stirring frequently. Add seasonings; cook and stir 30 sec.
Add potatoes, vegetable broth and 1/4 cup nuts; mix lightly. Close and lock lid. Turn Pressure Release Valve to Sealing position. Cook 10 min. using HIGH PRESSURE COOK setting.
Use Quick Pressure Release to carefully vent steam before opening lid. Slowly remove lid. Spoon 1 cup of the potato mixture into medium bowl; mash with fork. Return to ingredients in pressure cooker. Add chickpeas and 1/4 cup cilantro; mix well. Spoon into serving dish.
Top with sour cream, remaining nuts and remaining cilantro.