Preheat your oven to 380.
In a bowl, grate the onion using a cheese shredder.
Add the mayo, Greek yogurt, Worcestershire sauce, parsley, salt, pepper and Parmesan.
Mix until well combined.
Spread the mixture generously over your bread.
Bake for 12-15 minutes until lightly browned and bubbly.
Slice, serve and Devour!
