Pat shrimp dry with a paper towel. Smash shrimp with the back of your knife and mince finely until you get a paste. (Or use a food processor to whip the shrimp).
In a bowl, add minced shrimp, salt, white pepper, sugar, garlic, scallions, sesame seeds, egg white, and corn starch and mix until well incorporated.
Trim all the crust from white bread. Add ¼ of the shrimp paste to the bread and spread evenly. Cover with another piece of white bread. Use a butter knife to smooth the edges so shrimp doesn't fall out. Repeat with remaining bread and shrimp paste.
Air Fry at 375F for 6 mins on each side (12 mins total) without overcrowding (batch cook if needed).
Serve with spicy mayo sauce.
