Preheat oven to 450°F.
Toss potatoes, onion, and bell pepper with oil in a large bowl.
Sprinkle with seasoned salt and pepper; toss to coat well.
Spread potato mixture in a single layer on a foil-lined 15x10x1-inch baking pan.
Roast for 40 minutes or until potatoes are tender and golden brown, stirring halfway through cooking.
