1. Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or foil for easy cleanup.
2. In a large bowl, combine the olive oil, garlic powder, onion powder, oregano, thyme, salt, and pepper. Mix until well blended.
3. Add the chicken thighs to the bowl and toss to coat them evenly with the seasoning mixture. Transfer the chicken to the prepared baking sheet.
4. In the same bowl, add the halved potatoes and toss them in the remaining seasoning mixture. Arrange the potatoes around the chicken on the baking sheet.
5. Sprinkle the grated parmesan cheese evenly over the chicken and potatoes.
6. Bake in the preheated oven for 35-40 minutes, or until the chicken is cooked through and the potatoes are golden brown and crispy. I often use a meat thermometer to ensure the chicken reaches 165°F (74°C) for safety.
7. Remove from the oven and let it rest for a few minutes before serving. Garnish with fresh parsley if desired.

This process is as straightforward as the recipes my grandmother used to make, emphasizing flavor without fuss. Let your senses guide you, just as she did!