In a bowl, mix together the turmeric powder, coriander powder, garlic powder, ginger powder, salt, and pepper to create a marinade.
Rub the chicken pieces with the marinade, ensuring they are well coated. Let it marinate in the refrigerator for at least 30 minutes, or preferably overnight for more flavor.
Heat vegetable oil in a deep frying pan or pot over medium-high heat.
Carefully place the marinated chicken pieces into the hot oil and fry until they turn golden brown and crispy. Make sure the chicken is cooked through and reaches an internal temperature of 165°F (75°C).
Once cooked, remove the chicken from the oil and transfer them to a plate lined with paper towels to drain any excess oil.
Now it's time to "penyet" the chicken. Using a pestle or the back of a heavy spoon, gently smash the fried chicken to make it tender.
Serve the Ayam Penyet with cooked rice, sambal, fresh vegetables, and crispy crackers on the side. You can also squeeze some lime over the chicken for an extra tangy flavor.