Peel the zucchini and cut them into wide julienne strips with a mandolin or use a spiralizer to cut into noodles. Set aside.
Grease a nonstick pan with oil and place over medium heat.
Thinly slice onion and mince garlic and add it to heated pan.
Cook until fragrant and slightly tender.
Toss in zucchini noodles and cook for one minute.
Mix in parmesan cheese with noodles.
Cook until cheese is melted.
Season with salt and pepper.