It's very simple!
Cut the chicken fillet into cubes (I took the ham),
drain the liquid from the corn,
chop the onion finely, put
everything in a bowl.
Crackers can be taken ready-made, but I would recommend making them yourself - from a baguette or a white loaf, add some of the crackers to a bowl.
Add mayonnaise, do not need much, add salt to taste (I did not salt at all), mix, put in a salad bowl and sprinkle the remaining crackers on top.