Grandma’s Culinary Mastery Potato Soup

Ingredients:

2 pounds of russet potatoes, peeled and cut into large chunks (about 1-1/2 inch)
1/2 cup of chopped sweet onion
1/2 cup chopped celery
3 tablespoons all-purpose flour
Kosher salt and freshly cracked black pepper, to taste
1/4 to 1/2 cup (1/2 to 1 stick) salted butter
Water to cover
1 (12 ounces) can evaporate milk
Shredded cheese, for garnish, optional

Preparation: