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Preheat oven to 425°F. Line a large rimmed baking sheet with parchment paper.
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Spread cauliflower and garlic on the prepared baking sheet. Drizzle with 2 tablespoons olive oil and sprinkle with a pinch of salt. Roast until the cauliflower and garlic are golden, 18 to 20 minutes.
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Meanwhile, bring a large pot or Dutch oven of water to a boil. Add noodles and cook until tender, 6 to 8 minutes. Drain and rinse under cold water.
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Meanwhile, whisk soy sauce, maple syrup, sesame oil, fish sauce and sambal oelek together in a small bowl.
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Heat the remaining 1 tablespoon olive oil in the large pot (or Dutch oven) over medium-low heat. Add eggs, half of the scallions, serrano (or jalapeño) and the remaining pinch of salt. Cook, stirring to scramble, until the eggs are mostly cooked through, about 1 minute.