My Mom'S Venezuelan Chupe - cooking recipe

Ingredients

1/4 cup butter
1 large onion, chopped
3 russet potatoes, peeled and diced
3 skinless, boneless chicken breast halves, diced
8 cups water
2 cups frozen corn
salt to taste
ground black pepper to taste
1/2 cup milk, or to taste
4 (1 ounce) pieces mozzarella cheese sticks, coarsely chopped

Preparation

Melt butter in a large pot over medium heat. Add potatoes and onion. Cook, stirring constantly, until tender but not brown, about 5 minutes. Increase heat to medium-high and add chicken. Cook until chicken is white, 7 to 10 minutes. Add water and bring to a simmer. Add corn and bring soup to a simmer again.
Season soup with salt and pepper. Add milk and mozzarella cheese.