Delicious, cheesy spaghetti squash casserole makes a wonderful side dish, and is filling enough to serve as a meatless main dish.
This spaghetti squash casserole is cheesy, delicious, and so easy to make! I started out making this spaghetti squash casserole whenever I had leftover cooked spaghetti squash. But it is so good, so tasty and filling, that now I make it whenever I get the chance.
How to make spaghetti squash casserole
Scroll down to the recipe card for the details. Once you have cooked spaghetti squash (which you can quickly make in the microwave), it’s as easy as can be. Simply mix the squash with eggs, sour cream, shredded cheese and spices, then bake until set.
Reviews of this casserole
You can use this basic recipe and add all kinds of yummy things to it! Debbie, a reader of this blog, recently emailed me. She said, “I made your cheesy spaghetti squash casserole and it was delicious. I hate to get Allrecipes on you! But I added chicken, spinach, and mushrooms because I needed something really hearty to take to work. The base – your recipe – is excellent. I will use it again and again!”
I love Debbie’s suggestions! And I can also see myself adding cooked ground beef to the mixture before baking it into a casserole. Like all casserole recipes, this spaghetti squash casserole is a flexible, forgiving recipe. So go ahead and experiment with your own additions.
How to serve spaghetti squash casserole
It makes a wonderful side dish, but is also substantial and filling enough to serve as a meatless main course. I do usually serve it a side dish. And since I bake it in a 400°F oven, I like to serve it with a main dish that I can cook in the same oven, such as pork meatballs or maple glazed chicken.
Is this a healthy recipe?
I think it is. Spaghetti squash is very nutritious, and so are eggs. As for the dairy in this recipe, happily, current research tells us that for most healthy people, full-fat dairy is harmless, and might even be beneficial.
What about leftovers?
Leftovers of this spaghetti squash casserole keep well in the fridge, in a sealed container, for up to 4 days. Reheat them gently, in the microwave on 50% power.
More tasty casserole recipes
I really like casseroles and make them often. A couple of other tasty casseroles that I highly recommend: cheesy broccoli casserole (amazing!), and a main dish casserole that I love is this easy chicken casserole.
Cheesy Spaghetti Squash Casserole
INGREDIENTS
- Olive oil cooking spray
- 1 3 lb. spaghetti squash, or 2 1/2 cups (450 grams) cooked spaghetti squash
- 1 large egg
- 1/2 cup sour cream
- 1 teaspoon kosher salt
- 1/4 teaspoon black pepper
- 1/2 teaspoon dried thyme
- 1 tablespoon minced garlic
- 1 cup shredded sharp cheddar cheese
INSTRUCTIONS
- Preheat oven to 400 degrees F. Lightly spray a 1.5-quart baking dish with olive oil cooking spray.
- If you need to cook the spaghetti squash: Pierce the spaghetti squash in a few spots with a sharp knife. Microwave 6 minutes; turn to the other side and microwave 6 more minutes, until soft to the touch. Let stand for 5 minutes to finish cooking. Using a sharp knife, cut the spaghetti squash in half lengthwise. Allow to cool 5 minutes, until easier to handle. Scoop out the pulp and seeds from the center, then rake a fork back and forth to remove strands of the flesh onto a bowl. Set aside.
- In a large bowl, lightly whisk the egg. Add the sour cream, kosher salt, black pepper, dried thyme and minced garlic. Whisk until smooth.
- Mix in the cooked spaghetti squash and the shredded cheese.
- Transfer the mixture to the prepared baking dish. Bake until browned, about 40 minutes (it will smell wonderful!).
- Allow to cool 10 minutes, then scoop into plates, or if you’re patient, carefully cut into squares and serve.
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Vered DeLeeuw, LL.M., has been following a healthy real-food diet and blogging about it since 2011. She has taken 
