To make the sauce in a bowl mix the mayo, mustard, sriracha, onion powder, garlic powder, salt, and pepper to taste and dried oregano.
Mix until combined and set aside.
Take one tortilla and spread some of the sauce on it.
Arrange it with shredded lettuce, diced chilli, beans, canned corn and grilled chicken pieces.
Drizzle some sriracha sauce and wrap the whole tortilla tightly.
Cut in half and serve.