Preheat the oven to 300°F (150°C). Combine the kosher salt, brown sugar, smoked paprika, chili powder, garlic powder, onion powder, black pepper, and cayenne pepper in a small bowl. Rub the seasoning mixture evenly over the country style ribs and arrange them in a single layer in a 9 x 13-inch (23 x 33 cm) baking dish.
2 tsps (12 g) kosher salt, 1 tbsp (13 g) light brown sugar, 1 tsp (2 g) smoked paprika, 2 tsps (5 g) chili powder, ½ tsp (1.5 g) garlic powder, ½ tsp (1.5 g) onion powder, ½ tsp (1 g) black pepper, ¼ tsp (0.5 g) cayenne pepper, 3 lbs (1.36 kg) boneless country style ribs
Add the diced peaches to a medium saucepan over medium heat. Cook, stirring occasionally, until the peaches soften and release their juices, about 4 to 5 minutes. Pour in the bourbon and simmer for 2 to 3 minutes to reduce the sharp alcohol flavor.
3 fresh peaches, ½ cup (120 ml) bourbon
Stir in the barbecue sauce, brown sugar, apple cider vinegar, and Worcestershire sauce. Blend the mixture directly in the saucepan with an immersion blender until smooth.
1 cup (240 g) barbecue sauce, 2 tbsps (25 g) light brown sugar, 1 tbsp (15 ml) apple cider vinegar, 1 tbsp (15 ml) Worcestershire sauce
Pour about one-third of the peach bourbon barbecue sauce over the ribs, reserving the remaining sauce for glazing and serving. Cover the baking dish tightly with foil and bake for 2½ to 3 hours, or until the ribs are very tender.
Remove the baking dish from the oven and discard the foil. If there is a large amount of liquid in the bottom of the pan, carefully drain off some before continuing.
Brush the ribs with another third of the reserved sauce. Increase the oven temperature to 400°F (205°C) and return the ribs to the oven uncovered. Bake for 15 to 20 minutes, brushing once or twice more with sauce during baking, until the glaze is sticky and caramelized.
Let the ribs rest for 10 minutes before serving. Warm the remaining sauce and serve it alongside the ribs.