Melt the butter in a saucepan. Add the chicken along with the curry powder and turmeric. Add salt and toss well. Saute till the chicken is done. Drain the chicken out and set aside.
Grind all the ingredients under "for tomato sauce" to a paste. Add into the same saucepan and cook till thickened.
Preheat oven to 180 degrees. Line a 13x9 inch pan and brush with olive oil.
Blitz all ingredients together to make the batter. Do not overbeat.
Pour into prepared pan and tap to flatten. Sprinkle the chicken over the batter.
Bake for 15 minutes. Pull out. Spread the prepared tomato paste and the remaining ingredients on top.
Bake for another 15 to 20 minutes till the cheese is melted.
Serve hot and enjoy!