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Preheat the oven to 425 degrees F. Line a baking sheet with foil and spray with nonstick spray.
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Slice the spaghetti squash in half lengthwise and scrape out the sides. Brush the cut sides with olive oil. Place the squash cut-side down on a baking sheet. Roast for 25 minutes.
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Remove the baking sheet and flip the squash over. Use a fork to scrape some of the squash up. Season the squash with salt and pepper. Sprinkle on some of the basil and oregano too.
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Fill each squash with about ½ cup of marinara or Bolognese. Lay the slices of mozzarella on top. Sprinkle on a bit more basil, oregano and the pepper flakes.
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Return the baking sheet to the oven and bake the squash for another 15 to 20 minutes, until the cheese is golden and bubbly.
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Sprinkle the squash with finely grated parmesan and fresh herbs and serve!