Prepare potatoes as above. Preheat oven to 180℃/356℉.
Grease a 20 x 20cm square baking tin and line with baking paper.
Whisk yoghurt and flour in bowl, try to remove lumps. Whisk in eggs and beat lightly until smooth and no more flour lumps. Season.
Put half the sliced cooked potato on bottom of pan in a single layer. They don't have to touch. Put half salmon on top. Season well with herbs and salt and pepper. Pour on half the yoghurt mix.
Repeat the layer of potato, salmon, seasoning and yoghurt. The secret is balance and seasoning - having just enough potato to hold it together, but not so much it drowns out the taste of smoked salmon.
Bake for 30-35 minutes or until mix has risen and eggs are cooked.
Can be used as a main meal, or as a snack.