Cut pork tenderloin into 6 medallions about 2 inches thick.
Season with garlic powder, onion salt, oregano, salt and pepper.
Wrap with bacon so sides are covered. Secure with a toothpick.
Place medallions on one side of BBQ, sear for about 1 minute (bacon with flare up so watch that it doesn't burn. Turn burner off on the side of meat, leaving other burner on high.(indirect cooking), grill for about 10 minutes, flip and repeat process for other side.
Cook meat until internal temperature of 165 degrees.
For oven method preheat oven to 350 degrees.
Place pork on grilling rack.
Bake 30 minutes or until internal temperature of 165 degrees.