In a skillet over medium-high heat, add 1 tablespoon of olive oil. Once hot, add the sliced beef steak. Season with salt, pepper, and garlic powder. Cook for about 3-4 minutes until the beef is browned but still tender. Remove the beef from the skillet and set aside.
In the same skillet, add another tablespoon of olive oil. Sauté the onions and bell peppers until softened, about 5 minutes. If using, drizzle the Worcestershire sauce over the veggies for extra flavor.
Return the cooked beef to the skillet with the veggies and mix to combine. Cook for another 1-2 minutes to meld flavors. Remove from heat.
Lay a tortilla flat, sprinkle half with shredded provolone cheese, then add a generous portion of the beef and veggie mixture on top. Sprinkle a bit more cheese on top of the filling, then fold the tortilla in half. Repeat with the remaining ingredients.
Wipe the skillet clean and return to medium heat. Place the quesadilla in the skillet and cook for about 3-4 minutes on each side, or until the tortilla is golden and the cheese has melted. Add more oil if necessary to prevent sticking.
Once cooked, remove the quesadilla from the skillet and let it sit for a minute before slicing into wedges.
Notes
Serve with salsa or sour cream for dipping. Garnish with fresh cilantro or chopped green onions.