To make the remoulade, combine mayonnaise, yogurt, ketchup, shallot, garlic, lemon juice, Worcestershire, Dijon, and hot pepper sauce, mixing well.
To make the shrimp, combine flour and Creole seasoning and toss with shrimp.
Add egg white and mix to combine with shrimp.
Place cornmeal and breadcrumbs in large zip-top plastic bag and shake to combine.
Add shrimp to baggie and shake to evenly distribute mixture over shrimp.
In large skillet, heat olive oil over medium-high heat.
Add shrimp and cook about 3 minutes on each side, or until golden brown and cooked through. You will know the shrimp is cooked through when it is opaque.
To prepare the Po'Boys, spread remoulade on bottom of bun, then shredded lettuce, then top one fourth of the shrimp. Spread top of bun with remoulade sauce, to your liking.
Enjoy!