I'm going to be cooking a chicken curry, need advice! Ingredients:

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I'm going to be cooking a chicken curry, need advice!

Ingredients:
500g chicken breast, skinless/boneless/diced
1 big onion, sliced and diced
half a bulb of garlic, finely chopped
rice
knob of ginger, peeled
1 tbsp medium curry powder
1 tbsp ground coriander
1 tbsp ground turmeric
1 tbsp paprika
2 tbsp tomato puree
1 tbsp plain flour
500ml chicken stock
2 tbsp plain Greek yoghurt
green peas
salt and pepper

Method:
1) On high heat, cook the chicken with olive oil and then place to one side.
2) Reduce heat to medium, cook the onions, then add garlic. Add chicken back to the pan.
3) Add curry powder, ground coriander, ground turmeric, paprika, salt & pepper, and tomato puree and cook for a few more minutes.
4) Add plain flour and cook for a few minutes.
5) Add stock and leave to simmer for half an hour.
6) Take off the heat and stir in yoghurt, serve with rice and peas.
For the rice: boil in water with the ginger and remove the ginger when it's done. For the peas: also boil in water.

I'm wondering why plain flour is used in this. I've seen it mentioned in a few recipes and my only guess is that it helps to thicken it. Please let me know if this is a good way to cook a simple chicken curry!