Onion Souffle Cheese Dip

Really like this dip!  It is an indulgence, so we'll only have it once or twice a year.  I saute the chopped onions first to carmelize them but you dont have to.  To vary this mixture: replace cream cheese with any soft goat or sheep cheese, instead of a pecorino, use any hard grating cheese.  Add a blue cheese.  Bake the whole mixture in individual ramekins and serve room temp or warmed, not hot.  Serve with crackers or thin sliced toasted bread.

3-4 onions chopped
24 oz cream cheese
2 cup pecorino
1/2 cup mayo