Low-Carb Salisbury Steak

Ingredients (14)

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