Cod au Gratin

• 1 pound cod fillets, cubed
• ¼ cup butter
• ¼ cup flour
• 1 ¼ cups milk
• 1 tsp salt
• pepper to taste
• 1 small onion, finely chopped
• ½ cup breadcrumbs
• ½ cup cheddar cheese, grated

-Preheat oven to 375 º. Place cod in greased baking dish or individual baking dishes.

-In heavy saucepan, melt butter; stir in flour until smooth and remove from heat.

-Gradually stir in half the milk. Return to heat and beat until smooth and shiny. Gradually add remaining milk, salt, pepper and onion. Cook, stirring, until smooth and thickened.

-Pour sauce over fish and sprinkle with breadcrumbs and cheese.

-Bake in 375 º oven for 15 - 30 minutes until sauce bubbles and fish is cooked.