Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Slice the sweet potato into 1/8-inch thick rounds and toss them in a bowl with olive oil and a pinch of salt.
Arrange the slices in a single layer on the baking sheet and roast for 20-25 minutes, flipping halfway through, until the edges are crispy and golden.
While the potatoes roast, brown the ground turkey in a non-stick skillet over medium heat, breaking it into small crumbles.
Stir in the chili powder, cumin, garlic powder, and sea salt, cooking for another 2 minutes until the spices are fragrant and the turkey is cooked through.
Remove the sweet potatoes from the oven and cluster them together slightly; top with the seasoned turkey, black beans, and shredded cheddar cheese.
Return the tray to the oven under the broiler for 1-2 minutes until the cheese is melted and bubbly.
Garnish with dollops of Greek yogurt, mashed avocado, and fresh cilantro before serving immediately.