For the hamburger steaks
01 -
1 1/2 lb (680 g) 85% lean ground beef
02 -
1 teaspoon kosher salt
03 -
1 teaspoon onion powder
04 -
1/2 teaspoon garlic powder
05 -
1/2 teaspoon black pepper
06 -
1 tablespoon neutral oil
For the mushroom gravy and pan sauce
07 -
3 tablespoons unsalted butter
08 -
1 medium yellow onion, thinly sliced
09 -
8 oz (225 g) cremini mushrooms, sliced
10 -
2 cloves garlic, minced
11 -
2 tablespoons all-purpose flour
12 -
2 cups (480 ml) low-sodium beef broth
13 -
1 tablespoon Worcestershire sauce
14 -
1/2 teaspoon Dijon mustard, optional
15 -
1 tablespoon chopped fresh parsley, for serving