Add ground beef to large skillet, and brown over medium heat.
Drain browned ground beef, and return to pan along with onion and bell pepper.
Cook, stirring regularly, until vegetables are just softened, about 2-3 minutes.
Add beef and vegetable mixture to slow cooker along with remaining ingredients.
Stir to combine.
Cover, and cook on LOW for 3-4 hours.
Notes
Beef: I use 90% lean ground beef. See the notes above the recipe for using ground chicken or ground turkey.
Brown sugar: We like our sloppy joes a little on the sweeter side. If you don't, try starting with half the brown sugar (2 tablespoons - unpacked), and go from there by taste.
Chili powder: There is no kick to this recipe. The chili powder just gives the dish some extra flavor. If you like a little more heat, increase the chili powder to taste.