For the filling we need.
Boil the basmati rice until tender.
Boil the chicken breast for 20 minutes or until ready.
Grate the cheese 150 gr. on a coarse grater. Scald broccoli with boiling water for 3 minutes. Cool and chop finely. Boiled chicken fillet dismantle the fibers to pieces.
In a large bowl combine boiled rice, cheese, chicken and broccoli. Salt and pepper to taste. Stir. The filling is ready.
Preheat oven to 375F or 190C
Ready puff pastry cut into triangles. In each triangle, place the filling and wrap in a bagel, trying to make the filling was hidden.
Lubricate the baking sheet (30 to 40 cm) with butter and spread the bagels with a small distance from each other.
Bake in the oven for 10 minutes.
While baking the bagels, we'll make the sauce.
In a saucepan - melt the butter. Add corn starch, mix thoroughly and cook for one minute.
Add the chicken broth and mix with a whisk until smooth.
Cook the sauce over low heat, stirring constantly until thick.
In a separate saucepan, heat 1 Cup of milk. Milk should be hot.
Add hot milk to the sauce. Mix and add half a glass of sour cream. Mix again.
Cheddar cheese, grate on a fine grater. Add to the sauce and mix thoroughly. Add sugar and salt to taste. Cook the sauce over low heat until the cheese melts.
Sauce is ready.
After 10 minutes of baking, remove the bagels from the oven and pour the sauce. Send again in the oven and bake for 20 minutes or until Golden brown. Serve the dish to the table warm.