For the hamburger steaks
01 -
1 lb (450 g) 85/15 ground beef
02 -
1/3 cup (35 g) plain breadcrumbs
03 -
1 large egg
04 -
1 tablespoon Worcestershire sauce
05 -
1 teaspoon Dijon mustard
06 -
1 teaspoon onion powder
07 -
1/2 teaspoon garlic powder
08 -
3/4 teaspoon kosher salt
09 -
1/2 teaspoon black pepper
10 -
1 tablespoon olive oil
For the mushroom gravy
11 -
3 tablespoons unsalted butter
12 -
8 oz (225 g) cremini mushrooms, sliced
13 -
1 medium yellow onion, thinly sliced
14 -
2 cloves garlic, minced
15 -
3 tablespoons all-purpose flour
16 -
2 cups (480 ml) low-sodium beef broth
17 -
1 teaspoon Worcestershire sauce
18 -
1/2 teaspoon dried thyme
19 -
Salt and black pepper, to taste
20 -
2 tablespoons chopped fresh parsley