1. Preheat broiler.
2. Place onion and garlic on an aluminum foil-lined baking sheet; broil 5 1/2 inches from heat 10 minutes. Let stand 5 minutes.
3. Position knife blade in food processor bowl; add onion, garlic, and chopped red bell pepper. Process mixture until finely chopped. Add breadcrumbs and remaining ingredients to processor bowl; process until smooth. Serve with pita wedges, reduced-fat crackers, or raw fresh vegetables.