Briefly fry the bacon in a skillet until it is limp and has rendered fat but not yet browned; drain.
Use the bacon grease in the skillet, measuring 3 tablespoons of that and adding the butter.
Heat that in the skillet with the salt, pepper, Cajun spice and flour for a couple of minutes.
Add the cold milk all at once and use a whisk to stir over med-low heat until the gravy comes to a boil; boil one minute to thicken then turn off the heat.
Have your biscuits and mashed prepped and ready.
Stir together the flour coating of flour, Cajun spice, black pepper and salt.
Dredge the partially cooked bacon in the flour, tapping off excess.
Allow that to sit quietly for five minutes then dredge again.
Place bacon on mesh racks in the Breville smart air oven; set the Breville to 300F on the airfry/convection setting. (I recommend placing a pan on a rack underneath to catch the drippings.)
Cook for 5 minutes then turn the bacon over and cook 5-7 minutes more or until lightly browned and crisp.
Serve the chicken fried bacon with mashed, cream gravy and biscuits as you prefer.