Cook pasta as directed on package, adding peas during the last minute of cooking. Drain well.
Melt butter in large skillet on medium-high heat. Add shrimp; cook and stir 2 minutes or just until shrimp turn pink.
Stir in pasta mixture, half-and-half, green onions, Parmesan cheese and Seasoning. Reduce heat to low; simmer 5 minutes or until sauce is thickened, stirring occasionally. Let stand 5 minutes. Serve with additional cheese, if desired.