The pork tenderloin is seared and then roasted to perfection with some of the jalapeño glaze. The reserved glaze is drizzled over the pork just before serving.
Remove the silver skin and any excess fat from the tenderloins. Pat dry with paper towels. Sprinkle evenly with kosher salt, pepper, garlic powder, and onion powder.
Heat the olive oil in a large skillet over medium-high heat. Sear on all sides — about 8 to 10 minutes total time.
Meanwhile, combine the preserves and jalapeno in a small saucepan. Bring to a simmer. Cook for about 1 minute, stirring constantly. Put about half of the glaze in a small bowl and set aside.
Roast the pork tenderloins for 10 minutes. Brush with the remaining half of the glaze mixture and then roast for 5 to 10 minutes longer, depending on the thickness of the tenderloins. An instant-read thermometer or meat thermometer should register at least 145 F when inserted in the thickest part of a tenderloin.
Warm the remaining sauce mixture and spoon over the pork before serving.