Triple Onion Dip

Bahan-bahan (6 porsi)

• 2 teaspoons olive oil
• 2 small sweet onions, (minced)
• 2 whole green onions (thinly sliced), (white and green parts separated)
• 1¼ cups plain nonfat Greek yogurt
• ¼ cup light mayonnaise
• ¾ teaspoon garlic powder
• ¾ teaspoon onion powder
• ½ teaspoon salt, (plus more to taste)
• ¼ teaspoon freshly ground black pepper