Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes, then toss with olive oil and half of the sea salt and black pepper on the baking sheet.
Roast the sweet potatoes for 20-25 minutes until golden brown and tender.
While potatoes roast, season the chicken breast with garlic powder and the remaining salt and pepper, then sear in a non-stick skillet over medium-high heat for 6-7 minutes per side until cooked through.
In a small bowl, whisk together the Greek yogurt, tahini, lemon juice, and a splash of water to create a smooth, pourable dressing.
Place the chopped kale in a large bowl and massage it with a tiny bit of lemon juice for 1 minute until it softens and turns dark green.
Slice the cooked chicken into strips and layer them into a bowl with the massaged kale and roasted sweet potatoes.
Drizzle the creamy dressing over the top of the bowl and serve immediately.