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Preheat the oven to 400 degrees F (200 degrees C). Line a 10x15-inch rimmed sheet pan with parchment paper or foil. Juice 1 orange half (about 2 tablespoons). If you like, slice the remaining half and reserve for serving.
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Whisk together orange juice, agave nectar, oil, salt, paprika, black pepper, cumin, cinnamon, and cayenne in a large bowl. Add beans, sweet potato, and Fresno pepper; toss to combine. Spread on prepared sheet pan.
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Roast until sweet potatoes are tender, stirring halfway through, about 30 minutes. (To make ahead, chill sweet potato mixture for up to 4 days. Reheat before using in Step 4.)
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Working quickly, run each tortilla under running water to wet on all sides. Arrange tortillas evenly over sweet potato mixture. Roast, turning tortillas halfway through, until warmed through, about 3 minutes.
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Spoon sweet potato mixture into tortillas. Top with avocado. Serve with reserved orange slices and cotija.