I am not big fan of Blue cheese itself, but here is my version of how to do it!
TIME: about 10 minutes
1 pack of blue cheese
1 cup/2 dl cream
2 table spoons margarine
1-2 leeks or 1 yellow onion
1. Chop the leeks/onions and throw into pan with butter.
2. If the cream you use, is suitable for heating up (f.e. double cream is not!) - throw it into the pan now with crumbled blue cheese. Remember to lower the heat from the stove.
3. Mix the sauce on time to time, so the cheese will melt evenly.
And there you are again.