Low-Carb Salisbury Steak

Ingredients (14)

• + 2 pounds ground beef add to pantry
• + 1 onion, diced add to pantry
• ✓ 2 eggs
• + 1 tablespoon Worcestershire sauce add to pantry
• + 1 tablespoon dried parsley flakes add to pantry
• + 2 teaspoons salt add to pantry
• + ½ teaspoon garlic powder add to pantry
• ✓ ½ teaspoon onion powder
• ✓ ½ teaspoon ground black pepper
• + 7 tablespoons butter add to pantry
• + 2 cups sliced button mushrooms, or more to taste add to pantry
• + 1 tablespoon all-purpose flour add to pantry
• + 1 cup beef broth add to pantry
• + ½ cup sour cream add to pantry