Preheat the oven to 400°F. Line a baking sheet with parchment paper and arrange the bacon slices evenly spaced across it. Pop the bacon in the oven and bake for 18-20 minutes or until crispy.
Slice the turkey breasts through the center to form two cutlets. Place the cutlets between two pieces of parchment paper and go to town on it with a mallet. Once the turkey cutlet is at least 1/4 of an inch thick transfer it to a plate and set it aside.
In a wide, shallow vessel, like a pie plate, whisk together the cornstarch, the flour, and salt. In a separate bowl, beat the eggs and set it aside. Finally, pour the panko breadcrumbs into a pie plate.
Take a turkey cutlet and dredge it first in the flour, cornstarch mixture, then coat it in the egg, before tossing it in the breadcrumbs.
Once the cutlets are breaded, heat 1 inch of neutral oil, I used canola, in a large skillet and fry both cutlets until golden, about 3 minutes aside. Transfer the cutlets to a plate lined with paper towel to drain. At this point your bacon should be done, so do the same with it.
When you’re ready to build your sandwich, toast two slices of the bread you made earlier and cover both slices with mayo. Designate one slice as the bottom and squirt a little katsu sauce on top of the mayo. Add a bed of shaved cabbage, followed by the katsu. Add a few slices of bacon and tomato and add some salt and pepper. Finish the sandwich with a crown of green leaf lettuce and place the top slice, well, on top. Slice and serve.