In a medium bowl, combine the philly meat, Worcestershire sauce, salt, pepper, onion powder, and garlic powder. Toss to coat the meat and then let it sit and marinate while you prep the veggies.
Once the veggies are prepped, heat 1/2 tbsp of olive oil in a large skillet over high heat. Cook the philly meat in 2 batches so that it has enough room to sear (not steam). Cook the philly meat until it’s seared and cooked through.
Remove the cooked philly meat to a bowl. Pour another 1/2 tbsp of olive oil into the skillet and cook the second half of the philly meat. Once the second half of philly meat is cooked, remove it to the bowl as well.
Pour the remaining 1/2 tbsp of olive oil into the skillet and add the peppers and onion. Season the veggies with salt and pepper and cook until the veggies are crisp-tender, about 3-5 minutes.
Add the garlic and cook until fragrant, about 1 minute.
Add the philly meat back to the skillet and stir together to incorporate. Remove the skillet from the heat and preheat your broiler to low.
Top the skillet with the mozzarella cheese and stick into the oven to broil until the cheese is melted. Top with chives (or green onions) and serve. Enjoy!