Add the ground beef, bell pepper, and diced onion to a skillet and cook over medium heat until the beef is browned and the onions are translucent, about 5 minutes. Drain away any excess drippings.
Stir in the BBQ Sauce, reduce the heat to medium-low, and simmer until the sauce has reduced and the meat mixture is thick, about 10 minutes.
Spoon the Sloppy Joe mixture onto toasted hamburger buns.