Begin by spiralizing the zucchini into zoodles using a spiralizer or a vegetable peeler. Set aside.
In a large skillet, heat olive oil over medium heat. Add the minced garlic and sauté for 1-2 minutes until fragrant, being careful not to burn it.
Pour in the heavy cream and stir to combine with the garlic. Bring to a gentle simmer.
Add the grated Parmesan cheese, onion powder, and red pepper flakes (if using), stirring continuously until the cheese is melted and the sauce is creamy. Season with salt and black pepper to taste.
Gently fold in the zoodles, cooking for about 3-4 minutes until they are just tender but still have a bit of crunch. Avoid overcooking to keep the zoodles from becoming mushy.
Remove the skillet from heat and let it stand for a minute; the sauce will thicken slightly as it cools.
Notes
Serve with fresh parsley and extra Parmesan for garnish.