Penne and Spinach Bake

INGREDIENTS

• 8 ounces penne pasta
• 2 tablespoons butter or 2 tablespoons margarine, divided
• 1 cup chopped onion
• 2 teaspoons minced garlic
• 1/4 cup flour
• 2 1/2 cups milk
• 1 1/4 cups parmesan cheese, grated
• 1 1/2 teaspoons italian seasoning
• 1/2 teaspoon pepper
• 1/8 teaspoon salt
• 1 (14 1/2 ounce) can diced tomatoes with basil oregano and garlic
• 1 (10 ounce) package frozen spinach
• 1/4 cup dry breadcrumbs
• 2 tablespoons parmesan cheese