Peel onion and cut one half into thin rings. Chop the other half finely. Wash the chives, dab dry and cut into thin rolls up to approx. 8 cm from the tip. Fold the diced onion and chives into the cream cheese. Whisk the eggs in a bowl and season with salt and pepper. Heat oil in a pan. Add the eggs and let them simmer at medium heat.
Push the egg mass together several times. Remove the pan from the stove. Cut bread slices in half and spread each half with cream cheese. Spread the scrambled eggs over the 8 slices. Cut the trout into 16 pieces of the same size and place them on the bread. Garnish the breads with chives and onion rings