Brown the Beef: In a skillet over medium heat, brown the ground beef. Drain excess fat.
Combine Ingredients: Transfer the beef to the Crock Pot. Add ketchup, barbecue sauce, brown sugar, Worcestershire sauce, Dijon mustard, salt, and pepper. Stir to combine.
Cook: Cover and cook on low for 4–6 hours or on high for 2–3 hours until heated through and thickened.
Serve: Spoon the sloppy joe mixture onto toasted hamburger buns. Add optional toppings like pickles or cheese if desired.
