In boiling salted water, cook dumpling noodles according to package directions; drain.
Meanwhile, slice SPAM®, then cut into lengths. In large skillet, heat oil over medium-high heat. Add SPAM®, mushrooms and onions. Cook, stirring occasionally, 5 minutes or until SPAM® is golden and onions and mushrooms are tender.
Add teriyaki sauce to skillet; toss to combine. Stir noodles into SPAM® mixture. Toss gently to combine.