Cook haricots verts in boiling salted water to cover 1 minute; drain. Plunge green beans into ice water to stop the cooking process; drain well, pressing between paper towels.

Stir together brown sugar, soy sauce, and dried crushed red pepper. Sauté bell pepper, onion, and green beans in hot peanut oil in a large skillet over high heat 3 to 5 minutes or until beans look blistered. Sprinkle with seasoned salt.

Remove from heat; add soy sauce mixture to green bean mixture, and stir to coat.