INGREDIENTS
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2 teaspoons olive oil
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2 small sweet onion,minced
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2 green onions, thinly sliced, green and white parts separated
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1 1/4 cups plain Greek nonfat yogurt
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1/4 cup mayonnaise
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3/4 teaspoon garlic powder
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3/4 teaspoon onion powder
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1/2 teaspoon salt, plus more to taste
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1/4 teaspoon freshly ground black pepper