8 slices challah or brioche
3 tsp Dijon mustard
4 slices leg ham
8 slices gruyere cheese
2 Tbs milk
1 Preheat oven to 180C. Divide the mustard between 4 slices of bread and spread.
2 Top with the ham and cheese. Whisk eggs and milk together..
3 Heat a fry pan and add the butter. Use a cutter to cut out 8 or 16 rounds, depending on the size of the bread slices, then dip into the egg mixture making sure to coat all sides.
4 Fry in the pan until golden then transfer to an oven tray lined with baking paper. Cook for a further 5 minutes or until the cheese has melted. Serve immediately.