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Final plated shot of creamy spaghetti with tender chicken chunks and Parmesan garnish.

Monterey Chicken Spaghetti Casserole

This Monterey Chicken Spaghetti Casserole is a creamy, cheesy baked pasta made with tender chicken, spinach, ricotta, Monterey Jack cheese, and a savory ranch-seasoned sauce, finished with a crisp onion topping.
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Course: Main dish
Cuisine: American
Keyword: Monterey Chicken Spaghetti Casserole
Prep Time: 20 minutes
Cook Time: 25 minutes
Total Time: 45 minutes
Servings: 8

Ingredients

  • 12 oz spaghetti
  • 3 c cooked chicken diced
  • 9 oz frozen spinach thawed and excess moisture removed
  • 1 c ricotta cheese
  • 21 oz cream of chicken soup two 10.5 oz cans
  • 12 oz evaporated milk
  • 1 oz ranch seasoning packet
  • 2 c Monterey Jack cheese shredded
  • 3 oz crispy fried onions
  • Nonstick cooking spray

Instructions

  • Preheat the oven to 350°F (175°C). Lightly coat a 9×13-inch baking dish with nonstick cooking spray.
  • Break the spaghetti into thirds and cook according to package directions until al dente. Drain thoroughly and set aside.
  • Drain the thawed spinach completely, pressing between paper towels to remove excess liquid.
  • In a large mixing bowl, combine the evaporated milk, cream of chicken soup, ricotta cheese, and ranch seasoning. Whisk until smooth and fully blended.
  • Add the cooked chicken, spinach, and shredded Monterey Jack cheese to the mixture. Stir until evenly combined.
  • Fold the cooked spaghetti into the sauce mixture until the pasta is fully coated.
  • Transfer the mixture to the prepared baking dish and spread evenly. Sprinkle the fried onions over the top.
  • Cover with foil and bake for 20 minutes. Remove the foil and return to the oven for an additional 5 minutes, or until the onions are golden brown and the casserole is heated through.
  • Remove from the oven and allow to rest for several minutes before serving.

Notes

To make this Monterey Chicken Spaghetti Casserole gluten free, substitute the spaghetti with certified gluten-free pasta. Use gluten-free cream of chicken soup and ensure the ranch seasoning packet and fried onions are labeled gluten free, as these often contain hidden wheat-based additives.