Preheat the oven to 425 degrees Fahrenheit.
Thaw, rinse, and pat dry each tilapia fillet.
On one plate, combine 3/4 teaspoons Kosher salt, 1/2 cup parmesan cheese, and 1/2 cup breadcrumbs. Set aside.
Put 3 tablespoons of mayonnaise on another plate. Set aside.
Working with one tilapia fillet at a time, coat both sides with mayonnaise. Then press one side into the breadcrumb mixture so it's evenly coated. Flip and do the same on the other side. Set aside on a baking sheet.
Continue until all fillets are coated.
Bake for 15 - 17 minutes (depending on the thickness of the fillets), or until the fish is white and flaky. Don't overcook.
