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Creamy Butternut Squash Casserole

Rated as 4.3 out of 5 Stars

"Substitute Grana Padano cheese for Parmesan if desired. You can cube butternut squash a food processor with the pommes frites (french fry) cutter and then just pulse it one or two times with a regular blade."
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1 h 10 m servings 512
Original recipe yields 4 servings


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  1. Preheat oven to 425 degrees F (220 degrees C). Grease a 9x13-inch casserole dish.
  2. Heat olive oil in a skillet over medium heat; cook and stir onions in the hot oil until softened, about 10 minutes. Stir in squash and garlic; season with salt. Cook squash mixture, stirring occasionally, until squash is slightly tender, about 10 minutes. Add water if mixture gets too dry. Transfer squash mixture to the prepared casserole dish.
  3. Lightly whisk eggs in a bowl; stir in sour cream, Parmesan cheese, basil, and black pepper. Pour egg mixture over squash mixture; top with mozzarella cheese.
  4. Bake in the preheated oven until squash is tender and mozzarella cheese is bubbling, about 30 minutes.


  • Partner Tip
  • Reynolds® Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.

Nutrition Facts

Per Serving: 512 calories; 30.1 41.8 24.2 194 714 Full nutrition

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Read all reviews 66
  1. 83 Ratings

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Most helpful positive review

This is a very delicious way to cook butternut squash! Next time I think I will cook it at 375 or take it out of the oven sooner. Since I love nutmeg, I might add just a bit. :)

Most helpful critical review

definitely had a quiche texture, was not expecting that. Added extra salt as well

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Least positive

This is a very delicious way to cook butternut squash! Next time I think I will cook it at 375 or take it out of the oven sooner. Since I love nutmeg, I might add just a bit. :)

This was the first time my family and I had eaten butternut squash and it was great! Kids and husband loved it! I was out of sour cream, so I used about a half a cup of goat cheese, and instead ...

Never cooked or eaten butternut squash before. This was wonderful. Took a little longer than I thought to peel and cook squash, though. If a person doesn't have "experience" with this type of...

I thought this was a really creative way to use butternut squash. It was tasty. I added cubed chicken to make it a full meal. I cut the squash length wise and roasted it for 50 minutes at 400 de...

This turned out great! I cut the squash in half, and microwaved for 5 minutes so it could be peeled easily. Then putting this recipe together was a breeze. Everyone loved it for supper and we...

Very tasty meal. We had this with brown rice and a vinegary cole slaw salad. I made a few changes: I added beans to the squash and onions. I used cheddar instead of Parmesan. And I mixed th...

Just made this recipe...I didn't have any mozzarella so I used other shredded cheese...Used low fat Greek yogurt in place of sour cream and it was very tasty...My husband loved it! We will have ...

This was my first time eating butternut squash in, and I loved it! I did start cooking the squash first, before adding the onions, because I thought it would take a little longer to get the squa...

Fantastic!! I used feta cheese on top instead (used parmesan inside) and only had to use a 7x11 pyrex dish.