01 -
1 pound ground beef.
02 -
1/2 cup Italian breadcrumbs.
03 -
1 large egg.
04 -
1 tablespoon whole milk.
05 -
2 tablespoons Worcestershire sauce, divided.
06 -
3 tablespoons ketchup, divided.
07 -
1 teaspoon onion powder.
08 -
1 teaspoon garlic powder.
09 -
1 teaspoon black pepper.
10 -
3 tablespoons butter.
11 -
8 ounces mushrooms, sliced.
12 -
1 small onion, finely diced.
13 -
3 tablespoons all-purpose flour.
14 -
3 cups beef broth.
15 -
1 teaspoon dijon mustard.