Peel and slice the onions into rings. Dice the remaining onion for filling.

Finely chop the mixed vegetables to hide them in the filling.

Dice the chicken breast finely and add it to the vegetable mixture.

Crack 3 eggs into the mixture, season with a pinch of salt, and mix well.

Heat a pan with oil, place the onion rings, and spoon the egg mixture into each ring.

Carefully flip the onion rings using two spatulas.