Cook and drain spaghetti as directed on package; cover to keep warm.
Meanwhile, in 12-inch skillet, cook ground beef over medium-high heat 5 to 7 minutes, stirring occasionally, until thoroughly cooked; drain. Add onions, pea pods and bell pepper. Cook and stir 3 to 4 minutes or until vegetables are crisp-tender.
In small bowl, mix broth, ground red pepper, salt and cornstarch. Stir into beef and vegetables. Add peanut butter. Cook 1 to 2 minutes, stirring frequently, until thick and bubbly. Serve over cooked spaghetti; top with peanuts.