Mac and Cheese Henwood Style

INGREDIENTS

• 1/2 (16 ounce) package fusilli (spiral) pasta
• 1/4 cup margarine
• 1 tablespoon minced onion
• 1/4 cup all-purpose flour
• 2 cups milk
• 4 ounces processed cheese food
• 1/4 cup blue cheese crumbles
• 1/4 cup cubed Cheddar cheese
• 1 teaspoon salt
• 1 pinch ground black pepper
• 1/4 teaspoon dry mustard