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Make dip: Heat oil over medium heat and add onions and scallion whites. Cook, stirring often, until golden brown and soft, about 10 minutes. Remove from heat and allow to cool.
Combine onions with thickened or Greek-style yogurt, mayonnaise, onion powder, garlic powder, salt, pepper and scallion greens and stir well to incorporate. Chill for 1 hour to let flavors meld. Serve with chips.