Vegetarian Spaghetti Squash Casserole

5 / 5 (7 reviews)

This Spaghetti Squash Casserole channels all the flavor of our favorite lasagna recipe with a healthy low-carb twist! This gluten-free recipe can be served as a side dish or a main entree for dinner. Enjoy!

By: Jenn Laughlin - Peas and Crayons (via Peasandcrayons)
Original Publish: Aug 30, 2017
Last Updated: Mar 1, 2026
Prep: 10 mins
Cook: 55 mins
Yields: 4, 4 servings

Nutrition Facts

390 kcalCalories
24 gProtein
27 gCarbs
22 gFat
Finished Vegetarian Spaghetti Squash Casserole

Ingredients

Instructions

  1. Pre-heat oven to 400 degrees F.

  2. Slice your spaghetti squash in half lengthwise and scoop out the seeds. For easy cutting, you can poke a few holes in the squash and microwave it whole for 4-5 minutes to soften it up just a tad. The knife slides through much easier this way!

  3. Rub the cut side of the squash with a teeny bit of olive oil and place on a lipped baking sheet and roast face-down for about 40 minutes, or until tender and easily pierced with a fork. Cooking time will vary a bit depending on the size of your squash so adjust accordingly. Once ready, the once rock-hard exterior of the squash will be visibly softened with a tender interior.

  4. While the squash roasts, prep your cheese and veggies.

  5. Chop your onion, garlic, mushrooms, spinach and tomato, separately, then set aside.

  6. Bring a pan or skillet to medium-high heat with a drizzle of olive oil and sauté onion until tender and slightly golden, then add garlic and mushrooms and continue to cook until softened. Set aside.

  7. In a large bowl, combine ricotta, egg white, freshly grated parmesan cheese, fresh chopped spinach, Italian seasoning, basil, and garlic powder.

  8. Drain your mushroom/onion mixture and add to the bowl along with your chopped tomato. Mix well, adding a little salt and pepper to taste.

  9. Once your squash is ready, allow to cool slightly, then use a fork to separate the squash's interior into spaghetti-like strands.

  10. Next spritz a baking dish with olive oil and add your forked strands of spaghetti squash, top with cheese and veggie filling and mix.

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Chef's Notes

No jumbo squash to be found? You can easily use two 1.5 pound spaghetti squash if needed! The cook times will be exactly the same.

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Reviews from the Original Source

Trish Petees ★ 5.0/5

This recipe is delicious! I froze individual servings, then popped in the microwave , perfect dinner!

Jennifer Detroit ★ 5.0/5

Do the leftovers keep overnight?

Sara Buschick ★ 5.0/5

This was so good. I added ground turkey and it was all delish. My kids loved it too. It definitely made way more than 4 servings though. Will be making again!!

Mandy ★ 5.0/5

I had cooked the squash last night as I had it awhile and didn't want it to go bad. Looked up online for a recipe and found this. Just finished a big plate full and absolutely LOVE it! I love it better than lasagna and will now be my go-to. Thank you!

Dini ★ 5.0/5

I just ate, but honestly my mouth is watering looking at this! It looks so colorful and flavorful! I'm always looking for ways to incorporate vegetarian dishes into our meals, and this sounds perfect!

Ivory ★ 5.0/5

THS dish looks amazing, and it will be put on my must make soon list.

Diego Lopes ★ 5.0/5

I just love comfort food!! The photos here look so great, makes me wanna try the recipe even more!

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