Chicken, Corn and Potato stew

Ingredients

• (3½- to 4-lb) chicken

  cut into 8 serving pieces
  1 unit
• salt
  1¾ teaspoons
• black pepper
  1½ teaspoons
• unsalted butter
  3 tablespoons
• white onion

  finely chopped
  1 large
• dried oregano

  crumbled
  2 teaspoons
• russet (baking) potatoes
  1½ lb
• chicken broth
  6 cups
• water
  1 cup
• potatoes

  peeled, cut into ½-inch cubes, and covered with water in a bowl
  2 lb
• ears corn

  cut crosswise into 1-inch pieces
  3 unit