Cut steak, mushrooms into bite sized pieces and grade cheese

In a small pan add a thin coat of olive oil (you could use a different oil)

Heat up oil then add steak and cook until golden brown

In a separate pan sautée mushrooms and Spinach in butter. Add salt and pepper to taste

Lightly butter flour tortillas (optional)

Add graded cheese, steak, mushrooms on one side

Top off with cheese before folding and finish cooking

As an option add remaining cheese and any leftover steak and mushrooms