Heat oven to 200c. Grease a pie dish .

Cook down the onion in a little butter

Whisk the eggs. Add in the cream or milk , mustard and seasoning.

Layer up the filo sheets , brushing with melted butter between each one .

Sprinkle the cheese on top . Then add the onions . Pour over the egg mix . Then sprinkle over the bacon .

Put in the oven , after about 10 minutes. Turn the oven to 170c and cook until the egg is set ( about 15-20 minutes .

Remove from oven and leave for about 5 minutes before cutting