Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Peel and cube the sweet potato into 1/2-inch pieces, then toss them on the baking sheet with olive oil, sea salt, black pepper, and half of the chili powder and cumin.
Roast the sweet potatoes for 20-25 minutes, flipping halfway through, until they are tender and the edges are golden brown.
While the potatoes roast, season the chicken breast with the remaining chili powder and cumin, then grill or pan-sear over medium heat for 6-7 minutes per side until fully cooked.
Rinse and drain the black beans, then warm them in a small saucepan over low heat with a splash of water.
In a small mixing bowl, whisk together the nonfat Greek yogurt and lime juice to create a smooth crema.
Assemble the bowl by placing a base of baby spinach in a large bowl, then topping it with the roasted sweet potatoes, warmed black beans, and sliced chicken breast.
Drizzle the lime-yogurt crema over the top and garnish with freshly chopped cilantro before serving.