To Cook Quinoa: In a small saucepan over medium-high heat, bring quinoa and water to a boil, turn heat to low, cover and cook for about 15 minutes. Remove from heat and fluff with a fork; set aside to cool completely.
To Roast Pepitas: Preheat oven to 325°F. On a large baking sheet, toss together the pepitas, olive oil, salt, and smoked paprika. Roast for about 8-9 minutes until slightly golden and fragrant; set aside to cool.
To Make the Chipotle-Lime Vinaigrette: In a food processor, combine the apple cider vinegar, chipotle pepper, adobo sauce, lime juice, salt, cumin, and fresh cilantro; pulse a few times and scrape with a rubber spatula. With the food processor running, add the olive oil and process until smooth; set aside.
To Assemble Salad: In a large serving bowl, stir together the quinoa, black beans, red onion, mangoes, baby spinach, cilantro, and roasted pepitas. Drizzle with ¾ of the Chipotle-Lime Dressing; taste for seasoning. Add more dressing plus more salt and pepper, if needed. (If time permits, let the salad sit for 1 hour in the refrigerator before serving).
Garnish with mango, avocado, cilantro, and lime wedges. Store in an airtight container for up 2 to 3 days.