Start by spiralizing the zucchini into zoodles using a spiralizer. If you don’t have one, you can use a vegetable peeler to create thin strips. Set aside.
In a large skillet, heat the olive oil over medium heat. Add the minced garlic and sauté for 1-2 minutes until fragrant but not browned.
Add the steamed cauliflower florets to the skillet and pour in the vegetable broth. Bring the mixture to a gentle simmer and cook for about 5 minutes.
Remove the skillet from heat, and using an immersion blender, blend the cauliflower and broth mixture until smooth and creamy. If you don’t have an immersion blender, you can carefully transfer it to a regular blender.
Stir in the nutritional yeast, lemon juice, and lemon zest into the creamy mixture. Season with salt and pepper to taste.
In the same skillet used for the garlic, add the zoodles and sauté them for about 2-3 minutes until just tender.
Pour the lemon garlic alfredo sauce over the zoodles and toss gently until everything is well coated and heated through.
Serve immediately, garnished with fresh chopped parsley on top.