How to make the best "GÜVEÇ" (Famous Mediterranean dish)

Ingredients:
2 chicken legs & 2 chicken breasts
4 or 5 medium size potatoes
1 large onion
2 aubergines
1 red pepper
1 green pepper
1 yellow pepper
5 Friarelli peppers (Italian sweet peppers)
2 zucchini (courgettes)
3 cloves of garlic
5 tomatoes
500ml chicken stock
2 tablespoons of tomato paste
salt, pepper, paprika, cumin
olive oil & butter for the pan