Broccoli Cheese Soup

INGREDIENTS

• 1/2 cup butter
• 1 onion, chopped
• 1 (16 ounce) package frozen chopped broccoli
• 4 (14.5 ounce) cans chicken broth
• 1 (1 pound) loaf processed cheese food, cubed
• 2 cups milk
• 1 tablespoon garlic powder
• 2/3 cup cornstarch
• 1 cup water