Preheat oven to 425 degrees F.

Combine chili powder, cumin, and 1/4 teaspoon salt in a small bowl.

Place sweet potatoes on one side of a large rimmed baking sheet. Drizzle with 1 tablespoon oil and sprinkle with 1 teaspoon of the spice mixture. Toss to coat.

Combine chicken, bell pepper, and onion on the other side of the pan. Drizzle with the remaining 1 tablespoon oil and sprinkle with the remaining spice mixture. Toss to coat. Spread into an even layer.

Bake until the vegetables are tender-crisp and the chicken is no longer pink inside (165 degrees F), 18 to 20 minutes. Drizzle with 2 tablespoons lime juice. Stir gently, keeping the sweet potatoes and the chicken mixture separate.

Meanwhile, cook bulgur according to package directions. Add the remaining 1 tablespoon lime juice, 2 tablespoons cilantro, and the remaining 1/8 teaspoon salt and stir with a fork. Warm beans in a small saucepan.

Divide kale (or spinach) among 4 serving dishes. Arrange the bulgur, chicken mixture, sweet potatoes, and beans on top. Top with salsa and the remaining 2 tablespoons cilantro.