colcannon recipe

**Ingredients:** - 2 pounds potatoes (Yukon Gold or Russet), peeled and cut into chunks - 4 tablespoons unsalted butter - 1/2 cup milk or cream - 1 small head of cabbage, thinly sliced, or 2 cups chopped kale - 1 bunch green onions, finely chopped (white and green parts) - Salt and pepper to taste - Extra butter for serving (optional)