Trim fat cap off loin roast and slice into slices about ½" thick. You should get about 12 slices.
Put meat one slice at a time between 2 pieces of heavy plastic wrap or in a zip lock type bag. Pound with a meat mallet all over until cutlet is about ¼" thick and evenly texturized.
Put flour, salt and pepper in a re-sealable bag (use a shallow bowl if you want). Place 2 or 3 slices of meat in the bag and shake to coat. Make sure the cutlet is completely covered in flour but shake off any excess. Repeat until all slices are coated with flour and seasoning.
Set up a station with a wide bowl for each of the egg and bread crumbs.
Dredge each floured escalope first in the egg then the breadcrumbs. Let any excess egg wash drip off before moving on to breadcrumbs. Make sure the cutlet is completely coated (no bare finger marks).
Place on a platter until all cutlets are breaded. (You can refrigerate for several hours or overnight at this point if you like.)
Have an oven proof platter or dish ready. Preheat oven to about 300 degrees.
Preheat Air Fryer if necessary.
When you are ready to start cooking, spray each cutlet lightly with olive oil on both sides.
You will have to cook the schnitzel in batches. Lay out your schnitzel cutlets in a single layer with space between. For my Pampered Chef I get 2 schnitzel per tray.
Choose a setting that will give you 375°. Air fry schnitzel 8-10 minutes, switching trays and turning schnitzel at mid-point of cooking.
Keep cooked schnitzel warm in the oven until all cutlets are cooked.
Serve with fresh lemon wedges.