Preheat the oven to 400 degrees F.
Combine the paprika, sugar, salt, cumin, mustard powder, black pepper and cayenne pepper in a bowl.
Heat a large cast-iron pan over medium-high heat, and lightly coat with canola oil. Dredge the pork tenderloin in the rub, tapping off any excess, before searing on all sides, about 3 minutes per side. Place the pan into the oven and cook to medium doneness, 8 to 10 minutes. Promptly remove from the oven and let rest at least 15 minutes.
Serve with the Bourbon-Chipotle Sauce.
Heat the olive oil in a medium saucepan over medium-high heat. Cook the onions until soft, and then pour in 2 cups of the bourbon and cook until reduced to a few tablespoons. Stir in the chicken stock, apple juice, brown sugar, peppercorns and chipotle, and cook until reduced by half.
Strain through a fine mesh strainer, and then return to the pan and cook until it becomes the consistency of a sauce. Add the remaining 2 tablespoons bourbon and cook 2 minutes. Season with salt.