Use a spiralizer, mandoline, or vegetable peeler to create zucchini noodles.
Microwave the zucchini noodles for 1–2 minutes, then drain any excess liquid.
Melt the butter in a large skillet over medium heat.
Add the sliced chicken, salt, pepper, and garlic.
Cook for about 7 minutes until the chicken is golden and fully cooked.
Transfer the chicken to a plate.
In the same skillet, add the heavy cream, Parmesan cheese, and parsley.
Stir continuously until the cheese melts and the sauce becomes smooth.
Bring the sauce to a gentle boil and simmer for 3–5 minutes until slightly thickened.
Return the chicken to the skillet and coat it with the Alfredo sauce.
Remove the skillet from the heat.
Add the zucchini noodles and gently toss until evenly coated.
Serve the Zucchini Noodle Chicken Alfredo immediately with extra Parmesan cheese and fresh parsley.