Heat 1 tbsp unsalted butter on a pan over medium heat. Add 4 oz of onion in, stir for 5 minutes until they turn translucent. Transfer onion to a big bowl, set aside.

Make the beef patties: Add successively in the onion bowl: 12 oz ground beef, 1 tsp ground black pepper, 2 tsp Worcestershire sauce, 1 tsp garlic powder, 1/2 tsp oregano, 1.5 oz bread crumbs, 1 tsp thyme, and 1 egg.

Whisk together.

In another small bowl, whisk together 1 tbsp brown gravy mix and 2 tbsp water. Pour the brown gravy mixture into the big bowl of beef mixture, add 1 tbsp ketchup, then whisk together until well combined.

Divide the beef mixture into 8 equal parts. Use your hands to form them into balls first, then push against their surface to form 8 patties.

Sear the patties: On the same pan as used for the onion at step 1, heat 2 tbsp olive oil over high heat for a minute, then reduce it to medium heat and add the beef patties in. Spend 2 minutes to sear the first side, and 2 minutes for the second side. Remove the patties from heat, set aside.

On the same pan, turn it on high heat (without adding extra oil), add the 8 oz cremini mushroom in, and reduce the heat to medium-low. Stir fry for 5 minutes.

Add in the following ingredients successively: 4 oz of onion, 1 tbsp butter, 1/2 tsp garlic, 1 tbsp flour, 1 tsp mustard, 2 tbsp ketchup, 2 tsp Worcestershire sauce, 1 tbsp brown gravy mix (whisked with 1 cup of water). Whisk together.

Add the beef patties back in the pan, reduce the heat to medium-low.

Add the stir-fried cremini mushroom back to the pan, sprinkle 1 tbsp parsley on top.

Let it simmer for a minute, then remove from heat.

Serve immediately with pasta (or any veggie of your choice).