A key point in this dish is to get the mushrooms nicely caramelised. Use a very hot pan so the moisture evaporates away rather than stewing. Toss the spinach in right at the end to keep it bright ...
In the same pan add in 1 tablespoon of I Can’t Believe It’s Not Butter until melted and toss in the mushrooms are caramelize ... in the spinach, cooked fettuccini, salt and pepper and toss ...