Look for refrigerated cooked stir-fry noodles near the produce in the refrigerator section of the grocery store. Can't find them? Use two packages of any flavor ramen noodles. Cook and drain ramen as directed on package, omitting the seasoning packet.
Carefully separate the stir-fry noodles before adding them to the vegetable mixture. That way, the sauce coats all of the noodles.
Thai cooking is known for its spiciness, and this casserole is no exception! Note that the heat level varies among brands of Thai peanut sauce varies. Experiment to match your heat tolerance.