Preheat the oven to 400°F (200°C).

Toss the diced sweet potatoes with 1 tablespoon olive oil, 1/2 teaspoon salt, and 1/4 teaspoon black pepper on a baking sheet.

Roast sweet potatoes in the oven for 25-30 minutes until tender and lightly browned.

While sweet potatoes are roasting, heat the remaining olive oil in a large skillet over medium heat.

Add ground turkey to the skillet and season with garlic powder, onion powder, and the remaining salt and pepper.

Cook the turkey, breaking it into crumbles with a spatula, until browned and cooked through, about 8-10 minutes.

In a large mixing bowl, combine roasted sweet potatoes, cooked turkey, cherry tomatoes, and chopped spinach.

In a small bowl, whisk together Greek yogurt and lemon juice to make a dressing.

Pour the dressing over the sweet potato mixture and toss gently to combine.

Divide the mixture into bowls and top each serving with crumbled feta cheese.

Let the burger bowls rest for 5 minutes before serving.