2 tablespoon olive
6 cups kale, stems removed and shredded
1/2 cup thinly green onions, sliced
4 cloves garlic, minced
1/4 cup vegetable or chicken broth
Kosher salt and freshly ground black pepper to taste
4 pounds small russet or Yukon gold potatoes, scrubbed and cut into 2-inch cubes
1 tablespoon kosher salt
4 ounces sour cream (optional)
4 tablespoons butter
1 cup warm milk