INSTRUCTIONS
1. Adjust oven rack to middle position and heat oven to 450 degrees. Combine chili powder, paprika, salt, and pepper in bowl. Reserve 1 tablespoon spice mixture. Pat pork dry with paper towels and season with remaining spice mixture.
2. Heat oil in 12-inch nonstick skillet over medium-high heat until just smoking. Cook tenderloins until browned on all sides, 5 to 7 minutes. Transfer pork to wire rack set inside aluminum foil-lined rimmed baking sheet. Bake until meat registers 140 degrees, 15 to 18 minutes. Transfer meat to a platter, tent with foil, and let rest 5 minutes.
3. Combine reserved spice mixture, ketchup, vinegar, and sugar in bowl and brush over pork. Slice pork and serve.
