Layered Potato Pavee w/ Herbed Brie and Parmesan

This is a simple yet elegant dish featuring three cheeses and potatoes,  pairing well with about  ANY protein you can think of.   The potatoes are thinly sliced using a mandolin and blended with freshly sliced onion, garlic and parsley from my herb garden.
 This dish is perfect for everything from cozy dinner to Sunday brunch.  I even enjoyed squares of this mildly decadent dish at room temperature.  It really brought out the flavor profiles of the cheeses.  Substitutions for "skinnifying"can be made if desired, like fat free evaporated milk or other milk product. As is though, this recipe is not too hard on the mid-section and won't have to be added to your list of foods to be eaten semi-annually!!
Recipe:
6 c. sliced potatoes, such as russet
1 onion, thinly sliced, about 1 cup
1/2 c. fresh parsley, rough chopped
2-3 cloves, minced or pressed
2 tbsp. butter
1 tbsp. extra virgin olive oil
2 tbsp. AP flour
1 can evaporated milk, use fresh if desired
1/3 c. Herbed Brie
1/3 c. grated Parmesan
1/3 c. mozzarella
4 eggs, or egg substitute
SPST (Salt and Pepper to Suit Taste)
Olive Oil for drizzling, extra virgin
Shaved Parmesan for garnish
Preheat oven to 375*F.
Toss potatoes drizzled with olive oil with onion and parsley.  SPST
Spread evenly in a baking dish or casserole, about 1 inch thickness.
In a medium saucepot, melt butter and tbsp. olive oil over medium heat.
Once butter melts and bubbles are small and many, sprinkle in flour.
Whisk or stir vigorously, combining and cooking for about 1 minute.
Remove from heat and whisk in milk.
Return to heat and cook until thickened, about 5 minutes.
Reduce heat to medium low.  Add garlic.
Stir in cheeses until melted.
Temper in eggs, by adding about 1 tsp. of cheese sauce at a time to eggs in separate bowl, until it is increased to about 1 cup.
Whisk in eggs and remove from heat after about 1 minute.

Pour cheese sauce over potatoes and shake the dish to work the sauce down and around the potatoes.

Cover tightly with foil and bake until set, about 35 minutes.
Check doneness by inserting a knife in center, it should come out clean.
Remove foil and cook until golden, about 15 minutes.
Let stand before cutting into serving squares and garnish with shaved Parmesan.
Serves 12-15