Cook and drain fettuccine as directed on package.
Meanwhile, in 12-inch nonstick skillet, heat half-and-half to boiling over medium heat. Stir in cheese and garlic salt. Cook, stirring constantly, until cheese is melted and mixture is smooth.
Stir in vegetables. Cook about 7 minutes, stirring occasionally, until vegetables are tender. Serve over fettuccine. Sprinkle with pepper.