Sauté the Vegetables: In a large stockpot or Dutch oven, melt the 1 tablespoon salted butter over medium heat. Add the ½ cup diced carrots, ¼ cup finely chopped celery, and ¼ cup minced yellow onion. Sauté for 2-3 minutes until the onions soften.
Cook the Pasta: Pour in 8 cups of water and bring to a boil. Add the 8 ounces of thin spaghetti, vermicelli, or angel hair pasta and reduce heat to medium-low. Simmer until the pasta is tender, about 6-8 minutes, stirring frequently to prevent sticking.
Make the Soup Creamy: Add the 4 ounces of cream cheese and ½ cup heavy cream, stirring continuously until the cream cheese melts completely. Then, stir in 2 cups shredded cheddar cheese and mix until smooth. Sprinkle in the 1 ounce Ranch seasoning mix and the 1 packet top ramen seasoning, stirring well to incorporate.
Add the Protein: Stir in the 2 cups chopped rotisserie or cooked chicken and the 1 pound crumbled turkey bacon. If the soup is too thick, add up to 1 additional cup of water until you reach your desired consistency. Season with salt and pepper to taste.
Serve & Garnish: Taste and adjust seasoning as needed. Serve hot, garnished with extra turkey bacon and fresh parsley if desired.