This Ranch Chicken Spaghetti Squash Casserole is such a fun + out-of-the-box way to add veggies to dinner. Full of feel-good-ingredients like cooked spaghetti squash, spinach, cooked chicken + cooked rice, this casserole is made extra special by the addition of that beloved ranch flavor. Many readers report this is casserole has their kids licking their plates clean, which is always the telltale sign of a winning dinner recipe!

Chicken rice spaghetti squash casserole in a baking dish with fresh parsley and dill on top. A hand is holding the casserole dish and another hand is using a metal spoon to scoop out some.

Casseroles are kinda staple American comfort food. They are cozy. They are bubbly. They are perfect for when you need/want a throw-everything-into-one-dish-call-it-good kinda dinner. AND! They are also perfect for making veggies extra welcome at the dinner table. Especially spaghetti squash.

To be honest, I have always kind of felt “meh” about spaghetti squash. I didn’t like how wet it was when cooked. And the texture just wasn’t my jam. And, truthfully, it always felt a bit boring to me. However, I kept ending up with one in CSA box…so I became determined to find a way to enjoy.

And guys, I totally have! What I found is that when cooked spaghetti squash is drained, and then mixed with ranch dressing, some cooked chicken, and then popped into the oven for everything to meld together, the threads of the spaghetti squash almost melted into this the medley of flavors and textures. I personally adore this casserole with the addition of some cooked white rice a fresh, chopped spinach for a little added texture + color, but I’ve also tried it with just spaghetti squash…and it was still a delight, so you do add or subtract the rice depending on what feels good to you.

This spaghetti squash casserole is also an amazing way to reinvent that leftover cooked chicken and cooked rice hanging out in your fridge. And cooking your spaghetti squash can be easy breezy in your oven or in your slow cooker.

Here. Let’s make it together

Now, I am a visual learned and so I added this section to show you how this casserole should look at each step. However, the measurements and oven temps are listed in the recipe card below. You can use the “jump to recipe” button above to get you there quickly after you’ve seen how all of this comes together.

A person draining cooked spaghetti squash over a strainer.
First, you are going to start by draining the extra liquid out of your cooked spaghetti squash. You can do this either by putting the cooked threads into a strainer and using the back of the spoon to press all of moisture out. OR, you can use a clean dish towel or a few layers of paper towels for easy clean up. Simply dump the cooked spaghetti squash in the middle of the towel, wrap it up and squeeeezzzeeeeeee. With both methods, you want to get as much moisture as you can out of the squash before moving on.
A person pouring ranch dressing over a bowl with chopped spinach, drained spaghetti squash, cooked chicken, and cooked rice. There is a wooden spoon next to the bowl.
Once your spaghetti squash is nice + drained, you are going to toss it into a bowl with the cooked chicken, cooked rice, chopped spinach, and ranch dressing.
Mixed ingredients for chicken rice spaghetti squash casserole being transfer from a glass bowl into a casserole dish.
Give everything a good mixing and then transfer it to a casserole dish.
chicken + rice spaghetti squash casserole ready to go into the oven. A person is holding either side of the casserole dish.
Make sure everything is spread out evenly in the casserole dish and then pop it into the oven for 20-25 minutes.
Cooked chicken + rice spaghetti squash casserole on a white tables with bowls of ingredients and a napkin around it.
Once its hot and the top has a slight golden crisp, take it out of the oven and let it sit for 5ish minutes before digging in!

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A serving of chicken and rice spaghetti squash casserole in a bowl with a fork . A person is holding the bowl and fork.
Yum! Time to scoop up a nice big bowl of it and enjoy it!
Ranch Chicken and Rice Spaghetti Squash Casserole
5 from 7 votes

Ranch Chicken + Rice Spaghetti Squash Casserole

Yield: 6 servings
Cook Time: 25 minutes
Cuisine: American
Course: Main Course
This Ranch Chicken Spaghetti Squash Casserole is such a fun + out-of-the-box way to add veggies to dinner. Full of feel-good-ingredients like cooked spaghetti squash, spinach, cooked chicken + cooked rice, this casserole is made extra special by the addition of that beloved ranch flavor. Many readers report this is casserole has their kids licking their plates clean, which is always the telltale sign of a winning dinner recipe!

Ingredients
 

  • 1 ½ cups cooked rice, I used white rice, but use whatever your favorite is. Omit if you wish!
  • ¾ cup ranch dressing, or to taste, I like to use this homemade ranch recipe, but your favorite bottled brand will also work well.
  • 1 large spaghetti squash, cooked and drained (about 4 cups), I like to make mine in the slow cooker ahead of time for ease, but you can also just roast it in your oven.
  • 3 cups cooked and shredded chicken, you can easily do this in your Instant Pot or buy a rotisserie chicken to make this casserole extra easy
  • 2 handfuls baby spinach, rough chopped

Instructions
 

  • Preheat your oven to 350℉.
  • In a large bowl, combine all ingredients and mix
    until everything is even coated in ranch dressing
  • Transfer your mixture to a casserole dish.
  • Bake for 20-25 minutes or until casserole is bubbly and the top is slightly golden brown.
  • Let stand for 5 minutes to cool slightly before enjoying.
  • Store leftovers in an air-tight container fridge for 4-5 days.
Calories: 348kcal, Carbohydrates: 24g, Protein: 24g, Fat: 17g, Saturated Fat: 3g, Polyunsaturated Fat: 9g, Monounsaturated Fat: 4g, Cholesterol: 67mg, Sodium: 358mg, Potassium: 442mg, Fiber: 3g, Sugar: 6g, Vitamin A: 1157IU, Vitamin C: 6mg, Calcium: 70mg, Iron: 2mg
Nutritional information provided here is only an estimate shared for convenience and as a courtesy. Information will vary based on ingredients + brands used to create the recipe.