Green Bean Casserole

Ingredients

• 4 cups green beans, trimmed
• 1 cup onion, diced
• 2 cups mushrooms, diced
• 1 tablespoon butter, unsalted
• 2 tablespoons all purpose-flour
• 1 cup milk, skim
• 1 tablespoon Worcestershire sauce
• 1/8 teaspoon black pepper
• 1/8 teaspoon garlic powder
• 3/4 teaspoon salt
• 16 crackers, whole wheat, low sodium
• 1 teaspoon olive oil
• 1/2 teaspoon onion powder