Heat the olive oil in a large skillet over medium-high heat.
Add onions and peppers and cook 5-6 minutes until softened. Add the garlic and cook for 30 seconds.
Push the vegetables to one side. Season the steak, then add it to the empty side and sear 2-3 minutes.
Stir everything together and add the Worcestershire sauce.
Lay cheese slices on top and cover to melt.