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Preheat oven to 350 degrees. Place spaghetti squash on a baking sheet and bake for 45 minutes or until soft. Remove from oven and let cool for 5-10 minutes before shredding.
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While spaghetti squash is baking, mince and slice onions, garlic, and mushrooms.
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Heat olive oil skillet over medium heat, add onions and cook for 2-3 minutes until starting to get translucent. Add mushrooms and sauté for another 2-3 minutes until soft. Add minced garlic and sauce for an additional 2-3 minutes. Season with salt, pepper, Italian seasoning, and red pepper flakes if desired.
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Remove mushroom - onion mixture from heat when done.
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Meanwhile, once spaghetti squash has slightly cooled, shred with a fork into a medium bowl. Add pesto and stir to evenly coat spaghetti squash. Add 1/2 cup shredded parmesan and stir to combine.
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Arrange pesto spaghetti squash on plates, top with mushroom - onion mixture, burrata cheese, drizzle with olive oil, top with pepper and more parmesan.
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Enjoy