1.Heat The Olive Oil In A Skillet Over Medium-High Heat. Brown Tenderloins On All Sides, About 10 Minutes. Meanwhile, Mix Together Teriyaki Sauce, Chicken Broth, And Brown Sugar In A Bowl. Stir In Garlic, Red Chile Pepper, Onion, And Black Pepper. 2.Put Browned Tenderloins Into Slow Cooker, Cover With The Teriyaki Sauce Mixture. Cook On High For About 4 Hours, Turning 2 To 3 Times During The Cooking Time To Ensure Even Doneness. 3.Remove Tenderloins From The Slow Cooker And Let Rest For 5 Minutes Before Slicing. If Desired, Spoon Liquid Over Slices When Serving.