Preheat oven to 400°F.
Place thyme, chives, garlic cloves, brown sugar, salt and pepper in a food processor; pulse to make a coarse paste.
Rub mixture on the tenderloins and press firmly to allow the mixture to adhere to the meat.
Place 1 tablespoon vegetable oil in a large skillet over high heat.
Cook the pork 2-3 minutes total in the skillet. Gently turn pork after each minute until lightly browned, being careful not to burn the herb crust.
Place pork in the oven; roast 20-30 minutes or until internal temperature reaches 145° F.