1Heat oven to 400°F. Spray 11x7-inch (2-quart) glass baking dish with cooking spray.
2Spray 12-inch skillet with cooking spray; heat over medium-high heat. Add bell pepper mix; cook 5 minutes, stirring frequently. Add garlic; cook and stir 1 minute.
3Arrange half of the potato slices in baking dish. Mix salt and pepper; sprinkle potatoes with half of the mixture. Layer with half of the bell pepper mixture and one-third of the cheese. Repeat layers with remaining potato slices, salt mixture, bell pepper mixture and cheese.
4Cover; bake 40 minutes. Uncover; bake 10 minutes longer or until cheese is lightly browned and potatoes are tender.