I have to prepare a tortilla for a dozen-or-so folk next Monday night - it's a work thing (don't ask). It's for tapas so the portions are only small. I was going to fry up some spuds, chorizo, peppers, onion, garlic and mushrooms then add the eggs and brown it on both sids.

Does this sound right? Any tips?

Also: what quantities of the ingredients will I need?