Ingredients:

• 2 pounds Yukon gold potatoes, cut into 1-inch pieces
• 1 1/2 teaspoons kosher salt, divided, plus more to taste
• 1 bunch green onions, trimmed, white and green parts sliced
• 3/4 cup sour cream
• 3 tablespoons mayonnaise
• 1 tablespoon fresh lemon juice
• 1 teaspoon Dijon mustard
• 1 teaspoon dried minced garlic or 1/2 teaspoon granulated garlic
• 1 teaspoon dried minced onion or 1/2 teaspoon onion powder
• 1/2 teaspoon freshly ground black pepper
• 1 bunch fresh chives, chopped, divided