
This Monterey Spaghetti transforms ordinary pasta into a creamy, cheesy comfort food masterpiece that's become my go-to dish for potlucks and family gatherings. The combination of spinach and crispy fried onions creates a textural wonderland that elevates simple spaghetti to something truly special.
I discovered this recipe during a particularly chaotic holiday season when I needed something that would please both my vegetable-loving spouse and my cheese-obsessed children. Five years later it's still requested at nearly every family gathering, especially during the winter months.
Ingredients
Step-by-Step Instructions

The crispy fried onions are absolutely non-negotiable in this recipe. I once tried substituting them with caramelized fresh onions, and while still delicious, it lacked that distinctive textural contrast that makes this dish so addictive. My daughter actually complained that it wasn't the 'real' Monterey Spaghetti without that satisfying crunch on top!
Make Ahead Instructions
Vegetable Variations
Cheese Swaps

Serving Suggestions
Frequently Asked Questions
- → Can I use fresh spinach instead of frozen?
Yes, fresh spinach can be used. Wilt it in a pan to remove excess moisture before mixing it into the spaghetti mixture.
- → What can I use as a substitute for Monterey Jack cheese?
Colby, mozzarella, or a mix of mild cheeses can work as a substitute for Monterey Jack cheese.
- → How do I prevent the onions from burning during baking?
Keep the dish covered while baking and only add the fried onions during the final few minutes to ensure they turn golden without burning.
- → Can I prepare this dish ahead of time?
Yes, you can prepare the spaghetti mixture ahead of time, refrigerate it, and bake it just before serving for fresh results.
- → What side dishes pair well with this meal?
A crisp green salad or garlic bread pairs excellently with this hearty spaghetti dish.
- → How do I make it gluten-free?
Use gluten-free pasta and ensure that your fried onions and other ingredients are labeled gluten-free.