Oven Prep: Get your oven ready by preheating it to a toasty 425°F (220°C).
Make the Flavor Paste: In a medium bowl, whisk together the brown sugar replacement, all the pressed garlic, 2 tablespoons of the avocado oil, Dijon mustard, apple cider vinegar, paprika, and the optional chipotle powder. You'll end up with a wonderfully thick and aromatic paste.
Season the Pork: Pat your pork tenderloin completely dry with paper towels, then sprinkle it evenly all over with the salt and pepper.
Sear for a Great Crust: Heat the remaining 1 tablespoon of avocado oil in an oven-safe skillet over medium heat. Place the tenderloin in the hot skillet and brown it on all sides for about 4 minutes to create a delicious golden crust.
Coat with Goodness: Generously spread the garlic paste you prepared earlier all over the browned pork tenderloin.
Bake to Perfection: Transfer the skillet, uncovered, to your preheated oven. Bake for 18 to 25 minutes, or until an instant-read thermometer inserted into the thickest part of the pork reaches 140°F (60°C).
Rest and Enjoy: Carefully remove the tenderloin from the oven and let it rest on a cutting board for 5 minutes before slicing. This helps keep it super juicy and tender!