Heat a large skillet over medium-high heat. Brown beef until no pink remains, breaking it up as you go.

Add onion and bell pepper; cook 4 to 5 minutes until soft. Drain excess fat.

Stir in ketchup, brown sugar, Worcestershire, mustard, salt, and pepper.

Simmer 8 to 10 minutes until sauce thickens, stirring occasionally.

Spoon onto toasted buns and serve hot.