Open the lids of the Maruchan Cheddar Cheese Yakisoba packages halfway and remove the packets inside. Fill water to line indicated by arrows, close lid, and microwave on high for 4 minutes. Let cool for 1 minute. Carefully open, add packet, stir and set aside.
Heat a large sauté pan over medium-high heat and add oil and chicken. Season chicken with salt and pepper. Cook till chicken is cooked through. Add baby spinach and stir to wilt.
Add the noodles to the pan with parmesan and fresh pepper. Toss to coat. Divide servings onto plates or bowls.
Garnish with parsley if desired and serve.