Cook meat, bell pepper, onion and garlic in large skillet over medium-high heat 5 to 7 minutes or until meat is crumbled and no longer pink, stirring occasionally; drain. Reduce heat to medium-low; stir in Beefaroni, mustard, sugar, chili powder, salt and Worcestershire sauce. Cover and simmer 15 minutes.
Spoon meat mixture onto bottom halves of buns. Close with top halves. Garnish with pickle chip, if desired.