The Luxurious Sauce (Béchamel Base):
3 tbsp unsalted butter
3 tbsp all-purpose flour
2 cups whole milk, warmed
1 cup shredded sharp white cheddar (block, not pre-shredded)
1/2 cup finely grated Parmigiano-Reggiano
4 oz full-fat cream cheese, room temperature
1 tsp Dijon mustard (secret flavor amplifier)
1/4 tsp freshly grated nutmeg
1/4 tsp cayenne pepper (optional, for warmth)
The Golden, Crispy Topping:
1 1/2 cups Panko breadcrumbs
1/2 cup grated Parmigiano-Reggiano
3 tbsp unsalted butter, melted
2 tbsp chopped fresh parsley
1 tsp lemon zest (brightens the rich dish)
Optional Gourmet Add-Ins:
1 cup sautéed wild mushrooms (cremini or shiitake)
1/2 cup fried shallots or crispy prosciutto
2 tbsp chopped fresh tarragon (classic with asparagus)
