To make burger patties: in a large bowl combine beef, Worcestershire, garlic powder, salt, and ground black pepper together with hands. Equally divide burger mixture into 4 parts.

Take one of the quarters and flatten between your hands. Roll a bit to make the edges less jagged if necessary. Press your thumb into the middle of the patty; this ensures even cooking.

If cooking right away place them on a plate to the side. If you’re prepping these for later, separate patties with parchment or wax paper and refrigerate.

Heat a skillet on high heat. Melt tbsp of butter and when hot, add the burgers to the skillet.

Cook burgers for about 4 minutes, the juices will start to come through – once they do, flip them over. Cook for another 3 minutes for medium rare. Add cheese right after flipping if making cheeseburgers.

To make the mushrooms - crumble sliced mushrooms by breaking them apart. Add them to a hot skillet, drizzle with oil or spray with cooking spray. Season with salt and pepper. Sauté and stir for 5-8 minutes or until browned.

To make sauteed onion – add them to a hot skillet, drizzle with olive oil, season with salt and pepper. Stirring frequently, cook until browned, about 5 minutes. If caramelizing, add a pinch of sugar.

To make shake shack sauce – in a small bowl, combine ketchup, mayo, mustard, paprika, garlic powder, and salt.

Assemble burgers: placing them on buns, topping with sauce, and condiments.