Steps
1. Preheat the oven to 200 °C.
2. Cut the chicken and onion into small cubes and set aside.
3. Peel, wash, and dice the potatoes and put them in a large bowl.
4. Add the chicken cubes, onion, cheese, olive oil, salt, pepper and cumin to the bowl and mix together until everything is evenly distributed.
5. Grease a baking tray with butter and pour in the mixture.
6. Pour the milk over the top and spread it evenly.
7. Bake in the oven for 25-30 minutes.