Colcannon (Irish Mashed Potatoes) Recipe

Ingredients (6)

• 4 russet potatoes (2 to 2 1/2 pounds), peeled and cut into large chunks
• Salt
• 5 to 6 tablespoons unsalted butter, plus more for serving
• 3 lightly packed cups chopped kale, cabbage, chard, or other leafy green
• 3 green onions, minced (about 1/2 cup)
• 1 cup milk or cream