Heat the oven: Preheat to 425°F (220°C).
Line a baking sheet with parchment for easy cleanup.
Season the vegetables: Toss sweet potatoes, red onion, and bell pepper with olive oil, cumin, smoked paprika, chili powder, garlic powder, salt, and pepper until evenly coated.
Roast until caramelized: Spread in a single layer. Roast 22–28 minutes, flipping once, until edges are browned and centers are tender.
Warm the beans: In a small skillet over medium heat, add the black beans with a splash of water and a pinch of salt. Warm 3–4 minutes.
Stir in lime zest and a squeeze of lime juice.
Make the sauce: Whisk your chosen sauce ingredients until smooth. Adjust salt and lime to taste. Add water to thin if needed.
Prep the base: Warm cooked rice or quinoa.
If using kale, massage it with a drizzle of olive oil and a pinch of salt to soften. Spinach can be used as is.
Assemble the bowls: Divide grains into bowls. Top with roasted sweet potatoes and vegetables, black beans, and greens.
Add toppings: Finish with avocado, cilantro, pepitas, and pickled onions or jalapeños if you like heat.
Drizzle and serve: Spoon the sauce over the top.
Add a final squeeze of lime and a crack of black pepper.