Add in butter to melt. Add in flour and whisk to cook - while incrementally adding the milk to form a very thick bechamel.
Remove from heat and fold in the mashed chopped ham ,baked potato, nutmeg and cheese.
Rest the mix in the fridge for about 20 - 30 mins until set.
Form the batter into egg shapes and crumb with eggs and panko twice before frying until golden brown.