Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Dice the sweet potato into small half-inch cubes and cut the chicken breast into bite-sized pieces.
In a bowl, toss the sweet potato and chicken with olive oil, cumin, chili powder, sea salt, and black pepper until evenly coated.
Spread the chicken and sweet potatoes in a single layer on the baking sheet and roast for 18-20 minutes until the chicken is cooked through and potatoes are tender.
While roasting, rinse and drain the black beans, and slice the avocado.
In a small bowl, whisk together the Greek yogurt and lime juice to create a zesty crema.
Assemble the bowl by placing the fresh spinach at the bottom, then topping with the roasted chicken, sweet potatoes, and black beans.
Garnish with the avocado slices, a dollop of lime crema, and fresh cilantro before serving.