Season the sliced steak with salt, pepper, and Worcestershire sauce. Toss to coat the meat.
In a large skillet over medium-high heat, add part of the olive oil and the mushrooms.
Cook, stirring occasionally until the mushrooms are golden brown.
Remove the veggies to a plate and add the remaining olive oil.
Add in the seasoned steak and cook for 3-4 minutes to brown and cook the meat until just slightly pink inside. Don't overcook the meat or it will be tough.
Add vegetables back into the skillet and add the garlic. Cook for 2-3 minutes.
Turn off the heat and cover with the shredded mozzarella cheese.
Cover the skillet or place under the broiler to melt the cheese. Garnish and serve warm!