Begin by heating 2 teaspoons of olive oil in a large skillet over high heat. Add your diced or sliced beef, season it with salt and pepper, and cook until it’s fully browned. Stir often to avoid overcooking. Once ready, remove the beef and keep it warm on the side.
Dice your mushrooms, onions, and peppers while the beef rests. Heat 1 more teaspoon of olive oil in the same skillet and toss the veggies in. Cook over medium-high heat until they’re tender. Return the beef to the skillet and stir in the minced garlic. Cook everything together for another minute to meld the flavors.
Spread a thin layer of mayonnaise on one side of your tortillas (this is optional but delicious). Place half of the beef and veggie mixture on one side of each tortilla. Layer it with the provolone cheese, fold the tortilla in half, and press lightly to seal.
Heat a clean, non-stick frying pan over medium heat, and add the folded tortillas. Cook until each side is golden brown and crispy, flipping once. If you want that extra crunch, you can grease the pan with a touch of butter. Slice into wedges and serve warm.