Chicken a la King

How to make low budget healthy chicken a la king

1/2 lb. chicken fingers about 1-1/2 oz. ea.
4 large button mushroom,
2 large shallots
2 oz. green pepper,
1 & 1/2 T. red pepper,
2 c. good chicken stock,
1 T. dry sherry,
1 tsp. sea salt, pinch of white pepper,
wondra.