Preheat the oven to 300℉ (148℃). (Alternatively use a slow cooker covering the meat 3/4 of the way with broth or water).
For the Sandwich: Mix together the brown sugar, paprika, salt, black pepper, chili powder, garlic powder, onion powder, and cayenne pepper to make the dry rub.
Pat the brisket dry with paper towels. Rub the dry rub all over the brisket, covering all sides. Wrap the brisket in foil and place fat side up onto a baking sheet. Cook in the oven for 3 hours. (or in slow cooker for 6 - 8 hours)
Shut the oven and let the brisket rest for about 30 minutes before slicing.
Preheat your oven to 400°F (204°C). Line a baking sheet with parchment paper or lightly grease it.
Wash and scrub the potatoes thoroughly. Leave the skin on for extra texture and nutrients.
Cut each potato in half lengthwise, then cut each half into 4-6 wedges, depending on the size of the potato and your preference.
In a large bowl, combine the olive oil, garlic powder, paprika, dried oregano, dried thyme, salt, black pepper, and cayenne pepper (if using).
Add the potato wedges to the bowl and toss well to coat them evenly with the seasoning mixture.
Arrange the seasoned potato wedges in a single layer on the prepared baking sheet, ensuring they are not touching each other. This helps them crisp up nicely.
Bake in the preheated oven for 25 - 30 minutes, flipping the wedges halfway through the cooking time. They should be golden brown and crispy on the outside and tender on the inside.
Slice the brisket against the grain into thin slices.
Assemble the sandwiches: Place a generous amount of sliced brisket on the bottom half of each bun. Spoon bbq sauce over top (optional).
Place the top half of the bun over the brisket.
Serve the Texas brisket sandwiches with potatoes wedges, and amber ale.
Save or freeze excess Brisket for future meals.