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In the same skillet, add another tablespoon of olive oil. Add the minced garlic and chopped onion, cooking until the onion is translucent and the garlic is fragrant, about 3 minutes.
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Add the red pepper flakes (if using), diced tomatoes, tomato paste, and vegetable broth. Stir to combine.
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Sprinkle in the dried oregano and basil. Season with salt and black pepper to taste. Let the sauce simmer for about 10 minutes, allowing the flavors to meld together.