Mustard Potato Poppers

Ingredients (for about 20 potatoes):
500g floury potatoes

1 tbsp grainy mustard

1 tbsp medium-hot or Dijon mustard

1 egg

50g grated cheese (e.g., Gouda or Emmental)

2 tbsp chives, finely chopped

Salt & pepper

Pinch of nutmeg

Frying or baking oil

For the coating:

1 egg

3 tbsp flour

4-5 tbsp breadcrumbs

Preparation:
Boil the potatoes: