Combine breadcrumbs and Parmesan in a large shallow bowl.
Place egg and flour in another shallow bowl and whisk well.
Dip asparagus in the egg mixture, then the panko-parmesan and spray generously with olive oil.
Place in air fryer basket in an even layer and air fry 380F 6 to 7 minutes, flipping halfway until golden and tender.
To bake, preheat the oven to 425F.
Spray a sheet pan with oil, and place breaded asparagus on the sheet pan.
Spray with oil and bake 12 to 14 minutes, turning halfway, until golden and tender.
