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Spaghetti Squash Au Gratin

Rated as 4.7 out of 5 Stars

"This recipe is quick to prepare and a great alternative for a lower-carbohydrate, lower-calorie option in place of a potato side dish. My husband is a meat-and-potatoes kind of guy and even he loved this recipe."
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45 m servings 115
Original recipe yields 6 servings


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  1. Place spaghetti squash in a covered dish and add 1/4 inch of water. Microwave for 10 to 12 minutes. Scrape insides of squash with a fork and transfer to a small bowl.
  2. Heat margarine in a medium skillet over medium heat while spaghetti squash is cooking and cook onion, red pepper flakes, garlic powder, salt, and pepper until the onion is browned, 5 to 10 minutes.
  3. Preheat the oven to 375 degrees F (190 degrees C). Grease a baking dish with nonstick cooking spray.
  4. Mix spaghetti squash, onion mixture, sour cream, and 1/2 of the Cheddar cheese together. Transfer to the prepared baking dish and top with remaining Cheddar cheese.
  5. Bake in the preheated oven for 20 to 25 minutes. Turn on broiler for the last 2 to 3 minutes and broil until gratin is golden brown on top.


  • Cook's Note:
  • This is a great way to encourage your kids to eat more vegetables, although you may want to use a touch less red pepper flakes when preparing for them to lessen the spicy heat as it does have a bit of a kick to it.

Nutrition Facts

Per Serving: 115 calories; 4.8 10.5 8 10 265 Full nutrition

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  1. 61 Ratings

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Most helpful positive review

Yum! I followed the recipe exactly and it was delicious! I normally roast spaghetti squash in the oven but I used the microwave and it worked great. A nice change of pace!

Most helpful critical review

Hubby liked it but I didn't. I followed the directions, except for the pepper flakes. I thought the sour cream was too overpowering.

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Least positive

Yum! I followed the recipe exactly and it was delicious! I normally roast spaghetti squash in the oven but I used the microwave and it worked great. A nice change of pace!

Very good recipe. It's a little sweet because of the squash so I added extra salt and it was great. I will be making it again. Make sure to broil it so the cheese browns on top, that makes it ve...

I increased the recipe for a potluck: I doubled the squash, garlic powder, sour cream, and cheese. I left the margarine and pepper flake amounts as-is, and used half an onion. (I almost always ...

I grow spaghetti squash in WI, brought several down to FL. This was very good, and I’ll make it again. Severed under chicken cacciatore!! Yummy

I have been tired of making the same old "spaghetti and meatballs" with my squash so I was looking for something different. This recipe was amazing. I doubled it because I had a lot of squash ...

I will surely make this spaghetti squash, onion and cheese dish again. It is delicious, so easy to make and takes no time at all!. Thanks it was just what I was looking for, just as the recipe c...

Made this as written and will make it again. This is excellent and will certainly lend itself to creativity.

My company didn't like onions so I replaced it with fresh garlic. Really good, creamy and tasty.

My husband & I really liked this. I made it exactly as recipe is written except I punctured squash a few times before microwaving. BUT, to the review that suggested it was a good way to sneak...