Preheat your smoker or grill to 225°F (107°C). If using an oven, preheat to 375°F (190°C).
Prepare the jalapeños: Cut the jalapeños in half lengthwise and remove the seeds and membranes. Set them aside.
In a mixing bowl, combine the shredded smoked brisket, cream cheese, cheddar cheese, garlic powder, onion powder, smoked paprika, and black pepper. Mix until well blended.
Stuff each jalapeño half generously with the brisket and cheese mixture, pressing it down gently so the filling holds.
Wrap each stuffed jalapeño with one slice of bacon, securing it with a toothpick if desired.
Place the wrapped jalapeños on a baking sheet lined with parchment paper or aluminum foil.
If working on a smoker or grill, place the baking sheet directly on the grill grates. If using an oven, simply place the baking sheet on the middle rack.
Cook for 30 minutes, or until the bacon is crispy and the filling is hot and bubbly.
Remove from the heat and allow cooling for a few minutes. Serve warm with BBQ sauce drizzled on top or as a side for dipping.