Preheat your Yoder Smokers YS640 pellet smoker to 250ºF.
Slice the bacon into 1” wide slabs. Rub all surfaces with a small amount of mustard. Season all surfaces with Plowboys BBQ Yardbird Rub. Let set up for 5-10 minutes.
Smoke bacon slabs until the internal temperature reaches 200ºF (about 75-90 minutes). Turn the cooker up to 400ºF, then brush the slabs with House of Q Apple Butter BBQ Sauce and move the bacon directly over the firebox. Cook another 15 minutes. Remove from cooker. Rest 5 minutes. Slice into cubes for servings.