In a frying pan, heat oil over medium heat and sauté the onion for about 4-5minutes.
Remove from the heat and set aside to cool slightly.
Meanwhile ,in a bowl, mix together the eggs, horseradish sauce, and crème fraiche.
In the bottom of a baking dish, place the cooked onion.
top with the egg mixture, followed by trout and fresh dill.
Gently pus the trout pieces into the egg mixture.
Slide the Air Fryer Basket inside and adjust the temperature to 320 °F to preheat for 5 minutes.
After preheating, arrange the baking dish into the Air Fryer Basket.
Slide the basket into Air Fryer and set the time for 20 minutes.
After cooking time is finished, remove the baking dish from Air Fryer and set aside for about 5 minutes before serving.