Heat 1 tbsp oil in pan, add 300 gm boiled chicken and fry. Dissolve 1 tbsp corn flour in 1/2 cup water and add to the mixture. Turn the flame off, add 1/2 tsp black pepper, 2 tbsp garlic sauce, 2 tbsp yogurt, 1 tsp sugar and 1 cup mayonnaise. Mix well. Toast bread slices and spread prepared mixture. Make sandwiches and serve.