Time-Saving Tuna Casserole | Cooking Professionally

Ingredients

• 1/2 cup water
• 1 teaspoon chicken bouillon granules
• 1 (9-ounce) package frozen cut green beans
• 1 cup onion, chopped
• 1 cup fresh mushrooms, sliced
• 1/4 cup celery, chopped
• 1 clove garlic, minced
• 1/2 teaspoon dillweed
• 1/2 teaspoon salt
• 1/8 teaspoon pepper
• 4 teaspoons cornstarch
• 1 1/2 cups whole milk, cold
• 1/2 cup Swiss cheese, shredded
• 1/4 cup mayonnaise
• 2 1/2 cups egg noodles, cooked and drained
• 1 (12-ounce) can light tuna in water, drained and flaked
• 1/3 cup dry breadcrumbs
• 1 tablespoon butter