Cut the baguette in halves.

Cut the steak in long stripes.

Season with garlic powder, salt and pepper (you can add more pepper if you want, it’s very important for the general seasoning of this dish).

Preheat a grill pan to high. Grease with olive oil.

Once the olive oil is hot, add the red onion and steak stripes.

Cook at high heat until they are golden brown (around 12 minutes, depending on your temperature and how do you like the meat).

Lower heat and cover with gouda cheese slices (break them with your hands).

Once the cheese melts, fill the baguette with the meat and cheese mixture.