Monterey Chicken Spaghetti Casserole Recipe

There’s nothing quite like gathering around the dinner table for a dish that feels both nostalgic and new, which is exactly what this Monterey Chicken Spaghetti Casserole Recipe delivers. Packed with creamy, savory goodness and crowned with a perfectly crispy topping, it checks all the boxes for an irresistibly satisfying family meal. Tender chicken, twirls of spaghetti, spinach, and the melty bite of Monterey Jack cheese—all bound together in a comforting casserole—ensure everyone comes back for seconds. And that crispy French fried onion topping? It’s the crave-worthy finish you didn’t know you needed.

Ingredients You’ll Need

The beauty of the Monterey Chicken Spaghetti Casserole Recipe lies in its straightforward yet thoughtfully chosen ingredients. Each one plays a starring role in the flavor, texture, and even the lovely layers this casserole offers, so don’t be tempted to skip a thing!

• 12 oz dried spaghetti: The backbone of the casserole, spaghetti soaks up all the creamy sauce while holding the dish together.
• 4 cups chopped cooked chicken: Use rotisserie or leftover chicken for quick prep; this protein adds heartiness and makes the dish super filling.
• 1 (16-oz) container sour cream: Brings tangy creaminess that keeps every bite luscious without being too heavy.
• 2 (10.5-oz) cans unsalted cream of chicken soup: A classic base that ties all the elements into a rich, cohesive sauce.
• 2 cups shredded Monterey Jack cheese, divided: Melts like a dream for gooey pockets inside and a golden top layer.
• 1 (10-oz) package frozen spinach, thawed and drained: Adds color, nutrition, and a welcome earthy flavor—just be sure to press out any extra water.
• 2 garlic cloves, minced: A subtle aromatic kick that wakes up the whole casserole.
• 1 (6-oz) can French’s French Fried Onions, divided: Delivers the ultimate crunchy finish with savory depth.

How to Make Monterey Chicken Spaghetti Casserole Recipe

Step 1: Preheat the Oven and Prepare the Pan

Start by setting your oven to 350ºF—this helps the casserole bake evenly right from the start. Give your 9×13-inch baking dish a light spray with cooking spray to make serving and cleanup a breeze.

Step 2: Cook the Spaghetti

Bring a big pot of salted water to a rolling boil, then toss in the spaghetti. Cook just until al dente; you want noodles that keep a bit of bite since they’ll soften more as they bake. Drain thoroughly so your casserole stays creamy, not watery.

Step 3: Mix the Filling

In your largest mixing bowl, combine the cooked chicken, unsalted cream of chicken soup, sour cream, thawed and drained spinach, one cup of Monterey Jack cheese, minced garlic, and half the French fried onions. Stir this all together until every bit of chicken and spinach is coated in that dreamy, tangy sauce.

Step 4: Combine with Pasta

Gently fold the drained spaghetti into the bowl with your chicken mixture. Mixing gently but thoroughly helps the sauce cling to each noodle, making every forkful flavorful.

Step 5: Assemble the Casserole

Pour your mixture into the prepared baking dish, spreading it out to the corners for an even bake. You’ll see those flecks of spinach and chicken peeking through the cheesy base—already mouthwatering!

Step 6: Add Toppings

Time to make it beautiful and delicious! Sprinkle the rest of your Monterey Jack cheese over the top, then finish with the remaining French fried onions. This easy step is key to achieving a gooey layer and a crunchy crust.

Step 7: Bake

Slide the casserole, uncovered, into your preheated oven. Bake for 40 to 50 minutes, or until you see the cheese bubbling merrily and the onions have turned golden and crisp. The smell alone will have everyone circling the kitchen!

How to Serve Monterey Chicken Spaghetti Casserole Recipe

Garnishes

A sprinkle of chopped fresh parsley or chives adds a pop of color and herbal freshness that brightens up the rich, creamy flavors. If you love a bit of kick, a dash of black pepper or even a hint of smoked paprika over the hot casserole is a fantastic finishing touch.

Side Dishes

This Monterey Chicken Spaghetti Casserole Recipe is plenty hearty, but it pairs wonderfully with a crisp green salad tossed in a light vinaigrette. Try adding some garlic bread or soft dinner rolls to the side for soaking up every drop of that creamy sauce.

Creative Ways to Present

While the classic family-style bake is always a hit, try serving the casserole in individual ramekins for a fun, personalized dinner party presentation. You can also scoop leftovers onto toasted bread slices for an open-faced comfort food sandwich, or roll a scoop into blanched bell pepper halves and bake until golden for an inventive twist.

Make Ahead and Storage

Storing Leftovers

Allow the casserole to cool to room temperature, then cover tightly with foil or transfer slices to airtight containers. Leftovers will keep well in the fridge for up to three days, making it perfect for easy lunches or a speedy second dinner.

Freezing

To freeze, wrap the unbaked assembled casserole securely in plastic wrap and foil, then freeze for up to two months. When you’re ready to use, thaw overnight in the refrigerator and bake as directed, adding an extra 5 to 10 minutes if needed.

Reheating

Reheat individual servings in the microwave for 2 to 3 minutes, or pop larger amounts back into a 350ºF oven, covered with foil, for 20 to 25 minutes. If you want to revive that crispy topping, uncover during the last 5 minutes of baking.

FAQs

Can I use a different type of cheese in place of Monterey Jack?

Absolutely! While Monterey Jack melts beautifully and has a creamy flavor that’s hard to beat, you can substitute with mild cheddar, mozzarella, or even a blend of cheeses for a slightly different flavor profile.

How can I make this Monterey Chicken Spaghetti Casserole Recipe spicier?

For a little heat, try stirring a diced jalapeño or a pinch of red pepper flakes into the filling. Pepper jack cheese also works as a zesty, spicy alternative to regular Monterey Jack.

Can I use fresh spinach instead of frozen?

Yes, you can! Sauté about 8 cups of fresh spinach until wilted and squeeze out as much excess water as possible before adding it to the mixture—that way your casserole stays perfectly creamy.

What are the best ways to save time when prepping this recipe?

Rotisserie chicken is a huge time-saver and brings added flavor to the casserole. Also, prepping the filling and assembling the casserole the day before helps you slide it into the oven with minimal fuss on busy weeknights.

Is this casserole kid-friendly?

Definitely! The Monterey Chicken Spaghetti Casserole Recipe is a hit with kids thanks to its creamy texture, cheesy topping, and mild flavors. You can chop the spinach finely if you have picky little eaters in the house.

Final Thoughts

Warm, comforting, and big on flavor, this Monterey Chicken Spaghetti Casserole Recipe is one of those meals everyone looks forward to—whether it’s a weeknight or a special gathering. Give it a try and watch it become an instant favorite at your table!

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