Preheat the oven to 356 °F and meanwhile slice the tomato.

Mix the eggs with 2/3 of the cottage cheese until smooth and spread the mixture onto a baking sheet lined with parchment paper. Shape it into a rectangle and sprinkle with salt and pepper.

Bake in the oven until golden brown, then let it cool completely on the baking sheet.

Remove the parchment paper and spread the flatbread with the remaining cottage cheese. Top with the chicken breast, tomato, and arugula, roll up tightly, and cut in half. You can secure the rolls with a toothpick if needed.