Heat the butter in a small saucepan until melted.
Whisk together the cream, starch, garlic powder, and pepper in a separate dish until smooth. Gently pour in the mixture and simmer on medium-low for 5 minutes, until thickened.
Open a package of RAMEN Z, adding the noodles and soup.
Sprinkle in the cheese and toss gently to combine.
Transfer to a serving bowl and top with additional black pepper and cheese if desired. Enjoy hot!