Step 1

Preheat oven to 350 F (180 C). Cut cod into 1" pieces, arrange in an 8x8" baking pan. Alternately, you can divide them between 4-6 individual ramekins. Set aside.

Step 2

In a medium sauce pan, melt butter. Add onion and garlic and cook - stirring frequently - until onions are tender and translucent. Add corn starch to the pot, cook for another minute, stirring frequently. Add Dijon, whisking until well incorporated.

Step 3

Carefully add wine to pot, whisking until smooth. Cook for 2 minutes, whisking frequently. Add milk, once again whisking until smooth. Heat until mixture starts to thicken.

Step 4

Once sauce mixture starts to thicken, add half of the Parmesan and a small handful of the cheddar, stirring until thick, melted, and smooth. Add savoury, season with salt and pepper, to taste.

Step 5

Pour sauce over fish, stirring to coat and distribute evenly.

Step 6

Scatter cheddar cheese across the top of the fish mixture, then remaining Parmesan. Spread crumbled potato chips on top

Step 7

Bake – uncovered- for about 35 (individual ramekins) - 50 minutes (8x8 pan), or until fish is cooked through, and sauce is bubbly.

Step 8

Serve hot.