Focaccia ‘bout it

I baked a sun-dried tomato/basil/rosemary focaccia

I stacked this from top to bottom:

Focaccia
Dijon mustard
Cream havarti
Butter lettuce
White onion
Pepperoncini
Tomato
Avocado
Salsalito turkey
Cream havarti
Yellow mustard
Focaccia

What would you add or change?