1On large microwavable plate, microwave burgers uncovered on High 2 to 3 minutes, turning once, until thawed. In medium bowl, mix thawed burgers, cheese and Italian seasoning. Shape mixture into 16 balls.
2In 10-inch nonstick skillet, heat 2 teaspoons of the oil over medium heat. Add burger balls; cook, turning frequently, until brown. Remove from skillet; keep warm.
3In same skillet, heat remaining 2 teaspoons oil over medium heat. Add onion and bell peppers; cook, stirring frequently, until crisp-tender.
4Place 4 burger balls in each bun. Top with vegetable mixture. Serve with pasta sauce.