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Preheat oven to 425 degrees and line a baking sheet with foil.
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In a large bowl combine cauliflower, olive oil, garlic powder, chili powder, pepper and 1/4 cup of buffalo sauce. Stir to combine. Spread evenly on baking sheet and cook for 20 minutes, flipping halfway.*
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Five minutes before the cauliflower is done cooking, heat up the remaining buffalo sauce in a saucepan or in the microwave.
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Remove cauliflower from the oven and place it back in the bowl. Add remaining heated buffalo sauce and stir to combine.
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To assemble tacos, load each tortilla with romaine, avocado and cauliflower. Drizzle with ranch and top with cilantro or green onions.