In a large skillet, heat the oil over medium heat. Place the beef cubes into the skillet, seasoning with salt and black pepper as desired. Brown the beef for 1 to 2 minutes for each side.
Remove the beef and place in the slow cooker. Deglaze the skillet by adding 1 cup of beef broth and scraping the bottom with a wooden spoon to remove the cooked pieces.
Add the broth to the slow cooker with the remaining ingredients EXCEPT the quick pearl barley. Put the lid on the crockpot and cook on high for 4 to 5 hours (7 hrs on low) or until the beef is tender.
About 30 minutes prior to serving, stir in the quick pearl barley and remove the bay leaves.Note: If using regular pearl barley, add the barley with the other ingredients and cook for the entire time.