Classic Salisbury Steak With Garlic Mashed Potatoes Recipe: Comfort Heaven

Ingredients

• 1 lb (454 g) lean ground beef (90/10)
• 8 oz (226 g) mushrooms (sliced)
• 2 cups (480 ml) beef broth
• ½ cup (60 g) breadcrumbs
• 1 egg (lightly beaten)
• 1 small yellow onion (grated)
• 1 teaspoon kosher salt (for patties)
• ½ teaspoon black pepper (for patties)
• 1 tablespoon (15 ml) olive oil (for searing)
• 2 tablespoons (28 g) butter (for mushroom gravy)
• 2 tablespoons (16 g) all-purpose flour (for gravy thickening)
• 1 teaspoon kosher salt (to taste, for gravy)
• ½ teaspoon black pepper (to taste, for gravy)