Wash, peel, and large dice potatoes. Transfer to a medium saucepan, cover with water, and bring to a boil. Reduce heat to medium and cook until potatoes can be easily pierced with a fork, 10-12 minutes. Drain and return to saucepan.
4 medium yellow potatoes
Heat a sauté pan over medium heat.
In a medium bowl, combine beef, bread crumbs, Worcestershire, salt, and pepper. Mix well and form into 4 patties.
1 ½ lb lean ground beef
¼ cup panko bread crumbs
2 tsp Worcestershire sauce
½ tsp salt
½ tsp black pepper
Melt butter in pan. Add beef patties and cook until browned and almost cooked through, 3-4 minutes per side. Transfer to a plate.
1 tbsp butter, unsalted
Peel and thinly slice onion into half rings.
1 medium yellow onion
Once patties have been transferred, add more butter and onion to pan. Stirring frequently, cook until onion begins to soften, 2-3 minutes.
1 tbsp butter, unsalted
Wash and slice mushrooms. Peel and mince garlic.
1 lb white mushrooms
4 cloves garlic
Add mushrooms, garlic, and thyme to pan. Stirring occasionally, cook until mushrooms are tender, 3-4 minutes.
1 tsp thyme
In a small bowl, whisk together flour and broth until smooth. Add to pan and stir to combine.
1 tbsp all-purpose flour
8 fl oz (1 cup) chicken or vegetable broth
Return beef patties and any juices to pan. Cover and simmer until gravy thickens and steaks are cooked through, 4-5 minutes.
Wash and dry parsley. Shave leaves off the stems; discard the stems and mince the leaves.
1 small bunch Italian (flat-leaf) parsley
Add butter, broth, ½ of the parsley (save the rest for garnishing), salt, and pepper to potatoes. Mash until smooth.
1 tbsp butter, unsalted
8 fl oz (1 cup) chicken or vegetable broth
½ tsp salt
¼ tsp black pepper
To serve, place mashed potatoes on a plate and top with steaks and gravy. Garnish with remaining parsley and enjoy!