Codfish Soufflé with Potatoes - Riberalves

Ingredients

• 500 g deep-frozen soaked codfish Riberalves
• 250 g of boiled potatoes
• 2 cups of milk
• 2 tablespoons of olive oil
• 4 tablespoons of butter
• 3 tablespoons grated Parmesan cheese
• 5 eggs (separate the whites from the yolks)
• 1 bunch of chives