Cook potatoes
in boiling water until tender. Drain, saving cooking water. Add bouillon
cubes to hot liquid and stir until dissolved. Melt butter
in saucepan. Add onion and green pepper and cook gently 3 minutes,
stirring. Sprinkle in flour and let bubble. Remove from heat. Add milk
and potato water all at once. Stir in salt and pepper. Return to
moderate heat and cook until boiling and smooth, stirring constantly.
Turn heat to low and simmer 2 minutes. Add cheese
and stir until cheese is melted. Stir in potatoes and heat well. Serve very
hot, sprinkled with chopped parsley.