Creamy chicken and mushroom rissois

Ingredients For the outer layer 1 cup plain flour 1 1/2 cup milk 2 tbsp butter 1/2 tsp salt 1/2 tsp sugar For the filling 1 cup chicken finely minced 1 cup mushroom finely chopped 1 medium size onion 1 tsp garlic paste 1 1/2 tbsp plain flour 1 cup milk 2 tbsp butter Pinch of salt 1/2 tsp black pepper powder 1-2 cheese slices as per your taste 2-3 tbsp oil Oil to deep fry 1 egg whisked with 2 tsp water Breadcrumbs to coat