Beef Stroganoff Sauce with Meatballs

By SB

4.87 / 5

20min

40min

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½ teaspoon vegetable oil or as needed
1 pound ground sirloin
3 tablespoons Worcestershire sauce
1 egg
⅓ cup dry bread crumbs
½ small onion chopped
salt and ground black pepper to taste
¼ cup butter divided
1 (16 ounce) package mushrooms, sliced
2 tablespoons all-purpose flour
1 (10.5 ounce) can beef broth
1 teaspoon ground mustard
⅓ cup sour cream