Make the marinade. In a bowl, whisk maple syrup, balsamic vinegar, Dijon, olive oil, garlic, salt, pepper, smoked paprika (if using), and thyme until smooth.

Marinate the pork. Pat the tenderloins dry. Place in a zip-top bag or shallow dish, pour in the marinade, and coat well. Refrigerate for at least 30 minutes and up to 8 hours. Turn once or twice if you can.

Preheat and prep. Set the oven to 400°F (200°C). Place a heavy oven-safe skillet (cast iron works great) on the stove over medium-high heat. Remove pork from marinade, letting excess drip back into the bowl. Reserve the marinade.

Sear the tenderloins. Add a thin layer of oil to the hot skillet. Sear pork on all sides until browned, about 6–8 minutes total. Don’t rush; color equals flavor.

Roast to finish. Pour the reserved marinade around (not directly on top of) the pork. Transfer the skillet to the oven and roast 10–15 minutes, until the thickest part reads 140–145°F for medium doneness. Carryover cooking will raise it a few degrees as it rests.

Rest the meat. Move the pork to a cutting board and tent with foil for 8–10 minutes. This keeps it juicy and easier to slice.

Make a quick pan sauce. While the pork rests, place the skillet back on medium heat. Simmer the juices for 2–3 minutes to slightly reduce. Whisk in the butter to gloss and round out the flavor. Taste and adjust salt or add a squeeze of lemon for brightness.

Slice and serve. Cut the tenderloin into 1/2-inch medallions. Spoon the maple-balsamic sauce over the top. Serve with roasted sweet potatoes, green beans, or a simple arugula salad.