Combine all the marinade ingredients in a mixing bowl. Start by mincing the garlic and then adding fish sauce, oyster sauce, white pepper, ground turmeric, and brown sugar. Stir well until everything is blended together beautifully.

Add the chicken thighs to the marinade, ensuring each piece is thoroughly coated. For the best flavor, let the chicken marinate for at least 30 minutes in the fridge. If you have more time, consider letting it marinate longer!

Preheat your grill or oven to medium-high heat. This step is crucial for achieving that perfect sear on your chicken and ensuring it cooks evenly. The temperature should be well-adjusted before adding the chicken.

Cook the marinated chicken thighs either on the grill or in the oven for about 50 minutes. Make sure to turn them occasionally, achieving that lovely golden brown color while ensuring the internal temperature reaches 165°F (75°C) before serving.

Rest the chicken for a few minutes after cooking. This helps retain the juices, making each bite tender and juicy. You're almost ready to indulge in your creation!