Cod Cheeks Au Gratin

Name: Cod Cheeks Au Gratin
Ingredients: 1 lb Cod Cheeks; 2 tbsp unsalted butter; 1 shallot (finely chopped); 2 large cloves of garlic (pressed); 2 tbsp flour (Wondra works best for sauces); 1 tbsp stone ground mustard; 2 tbsp dry white wine; 1 cup milk; 1/4 cup Shredded Parmesan Cheese; 1 Cup Shredded Cheddar Cheese (you can get fancy and use a Bacon Cheddar or Garlic Herb Cheddar for more flavor); 1 teaspoon thyme or tarragon (your preference, both are great!); Salt & pepper; 1 cup crumbled potato chips (or enough to cover dish)