Preheat oven 400F

Combine first 9 ingredients in a small bowl; set aside

Rince shrimp with cold water; drain well. Layer shrimp, lemon slices and onion slices in an ungreased 13 x 9 2 baking dish.

Pour lemon herb mixture over shrimp. Bake uncovered for 20 to 25 mins. or until shrimp turn pink, basting occasionally with pan juices.