Monterey Spaghetti Bake with Rotisserie Chicken | Easy Cheesy Casserole

This Monterey Spaghetti Bake with Rotisserie Chicken is a creamy, cheesy baked spaghetti casserole made with tender shredded chicken, Monterey Jack cheese, sour cream, eggs, spinach, and crispy fried onions. It’s an easy, comforting dinner recipe that’s perfect for busy weeknights, potlucks, or make-ahead meals.

Using store-bought rotisserie chicken makes this baked spaghetti casserole even faster while adding protein and rich flavor the whole family loves.

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Why You’ll Love This Cheesy Chicken Spaghetti Bake

• Easy baked spaghetti with rotisserie chicken
• Creamy, cheesy comfort food casserole
• Great way to use leftover or store-bought chicken
• Family-friendly and freezer-friendly
• Perfect for weeknight dinners and potlucks

This recipe is a cozy cross between chicken spaghetti and a classic baked pasta casserole, finished with golden fried onions for the perfect crunch.

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Ingredients for Monterey Chicken Spaghetti Bake

Chicken Spaghetti Casserole Ingredients:

• 4 oz spaghetti, broken into 2-inch pieces
• 1 large egg
• 1 cup sour cream
• ¼ cup grated Parmesan cheese
• ¼ tsp garlic powder
• 2 cups Monterey Jack cheese (8 oz), shredded
• 1 pkg (10 oz) frozen chopped spinach, thawed and drained
• 2 cups shredded rotisserie chicken
• 1 can (2.8 oz) French-fried onions, divided

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How to Make Monterey Spaghetti Bake with Chicken

Step 1: Cook the Spaghetti

Cook spaghetti according to package directions until al dente. Drain well and set aside.

Step 2: Make the Creamy Base

In a medium bowl, whisk together the egg, sour cream, Parmesan cheese, and garlic powder until smooth.

Step 3: Add Chicken & Cheese

Stir the shredded rotisserie chicken into the egg mixture. Fold in Monterey Jack cheese, spinach, and half of the French-fried onions.

Step 4: Combine with Pasta

Add the cooked spaghetti and gently toss until evenly coated.

Step 5: Bake

Transfer the mixture to a greased baking dish. Bake at 350°F for 30 minutes, or until hot and set.

Step 6: Add Crispy Onion Topping

Remove from the oven, sprinkle remaining fried onions on top, and return to the oven for 5 minutes, or until golden brown.

Let rest for 5–10 minutes before serving.

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Tips for the Best Chicken Spaghetti Bake

• Drain spinach very well to prevent excess moisture
• Use white and dark meat rotisserie chicken for best flavor
• Shred cheese from a block for smoother melting
• Don’t overcook the pasta before baking

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Make-Ahead, Storage & Freezing Instructions

Make Ahead:
Assemble the casserole up to 24 hours in advance. Cover and refrigerate until ready to bake.

Storage:
Store leftovers in an airtight container in the refrigerator for up to 4 days.

Freezing:
Freeze baked or unbaked casserole (without onion topping) for up to 2 months. Add fried onions fresh before reheating.

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Variations & Add-Ins

• Add cooked bacon for smoky flavor
• Swap Monterey Jack for Colby Jack or mozzarella
• Add sautéed mushrooms or onions
• Stir in red pepper flakes for a spicy chicken spaghetti bake

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Frequently Asked Questions

Can I use leftover cooked chicken instead of rotisserie chicken?

Yes, any cooked, shredded chicken works well in this recipe.

Can this chicken spaghetti bake be made gluten-free?

Yes, simply use gluten-free spaghetti.

Is this a good freezer meal?

Absolutely — this casserole freezes and reheats beautifully.

If you love easy chicken casseroles, baked spaghetti with chicken, or creamy comfort food dinners, this Monterey Spaghetti Bake with Rotisserie Chicken is a must-try. It’s hearty, satisfying, and perfect for feeding a hungry family.