Preheat the oven to 425°F (220°C). Line a baking sheet with parchment paper and lightly spray with cooking spray.
In a medium bowl, combine the Greek yogurt, garlic powder, onion powder, smoked paprika, salt, and black pepper. Mix well.
Add the chicken strips to the yogurt mixture and toss to coat evenly. Let marinate for 10 minutes.
In another shallow bowl, mix the whole wheat breadcrumbs and grated Parmesan cheese.
Remove each chicken strip from the yogurt mixture, allowing excess to drip off, then coat thoroughly in the breadcrumb mixture. Place coated strips on the prepared baking sheet.
Lightly spray the tops of the coated chicken fingers with cooking spray to help them crisp up.
Bake in the preheated oven for 18-20 minutes, flipping halfway through, until the chicken is cooked through and the coating is golden and crispy.
Remove from oven and let cool for 2 minutes before serving.