Yayla (Turkish Yogurt Rice and Mint Soup )

One of the best soups i love is Yayla Soup. Full of great taste and easy to make.
Ingredients:
1/2 cup rice boiled until very soft in about 3 cups of water
1 egg
2 tbsp all purpose flour
1 and 1/2 cup plain Turkish yogurt
1 tsp salt or as you like
enough boiling water for the consistency of the soup
also 2 tbsp butter
1tbsp mint