Spiralize the zucchini into noodles. I used the angel hair attachment.
Heat a pan to medium. Add olive oil, minced garlic and onion powder. If adding crushed red pepper, include now as well. Saute 1 minute moving around pan so not to burn garlic.
Add noodles. Stir to combine completely coating zoodles and let cook 3 minutes.
Add soy and teriyaki sauce. Stir to combine throughout. Cook 3 minutes, stirring occasionally.
Add diced mushrooms. Stir and cook 3 minutes.
Zoodles will now be al dente. If you prefer completely soft noodles, cook longer testing every minute to desired doneness.
TASTE! Adjust seasoning if needed.
Note: Adding cooked chicken, beef or shrimp would be delicious! You could do this at the same time as adding the mushrooms. They'll cook as the meat warms through with the sauce.