Cheese Spinach Soup

Ingredients

• 1/2 cup chopped onions
• 1/2 cup chopped celery
• 1/4 cup butter
• 1/4 cup flour
• 1/2 teaspoon salt
• 1/8 teaspoon pepper
• 4 cups milk
• 1 package frozen chopped spinach thawed
• 1 1/2 cups shredded american cheese