– 1 lb lean ground beef – 1 egg – ½ cup plain breadcrumbs – 1 tablespoon ketchup – 1 tablespoon Worcestershire sauce – 1 teaspoon mustard – ½ teaspoon black pepper – ½ teaspoon onion powder – ½ teaspoon garlic powder
– 2 tablespoon salted butter – 10 oz button mushrooms, sliced – 1 large onion, sliced – 1 garlic clove, minced – 2 tablespoon all-purpose flour – 3 cups beef broth – 1 tablespoon Worcestershire sauce – Salt and pepper to taste
– 2 lbs Yukon gold potatoes, peeled and chopped – 2 teaspoon salt – 4 tablespoon unsalted butter – ½ cup whole milk, hot – 1 teaspoon Dijon mustard – Salt and pepper