Meatball Stroganoff

Bahan-bahan (6 porsi)

• 2 slices white bread (crust removed)
• 3 tablespoons milk
• 1 pound lean ground beef
• 1 egg
• 1 tablespoon dried parsley
• ½ teaspoon garlic powder
• ½ teaspoon salt
• ½ teaspoon black pepper
• 1 tablespoon olive oil
• 2 tablespoons butter
• 8 ounces mushrooms (sliced, white or cremini)
• 2 cloves garlic (minced)
• 2½ tablespoons all-purpose flour
• 1 (10.5 ounces) can condensed French onion soup (or condensed beef broth*)
• ¾ cup water
• ½ tablespoon Dijon mustard
• ½ cup sour cream