Slow Cooker Barbecue Beef Sandwiches

3	pounds beef boneless chuck roast
1	cup barbecue sauce
1/2	cup peach or apricot preserves
1/3	cup chopped green bell pepper
1	tablespoon Dijon mustard
2	teaspoons packed brown sugar
1	small onion, sliced
12	kaiser or hamburger buns, split

1. Trim excess fat from beef. Cut beef into 4 pieces. Place beef in 4- to 5-quart slow cooker.
2. Mix remaining ingredients except buns; pour over beef. Cover and cook on low heat setting 7 to 8 hours or until beef is tender.
3. Remove beef to cutting board. Cut into thin slices; return to cooker.
4. Cover and cook on low heat setting 20 to 30 minutes longer or until beef is hot. Fill buns with beef mixture.
   
   New Betty Crocker summertime favorite!