Combine yogurt, salt, pepper, olive oil, dried oregano, grated garlic cloves, onion powder, lemon juice and fresh thyme.
Marinate the chicken in the yogurt mixture for 1 hour at room temperature or 4 hours in the fridge.
Preheat the grill to 375ºF / 180ºC.
Remove the chicken from the marinade and remove excess yogurt marinade from the chicken; no need to wipe, by hand is fine.
Drizzle the chicken’s skin side with grapeseed oil (or another neutral oil) and place it, skin side down, on the grill.
Grill the chicken until the thickest part of the thigh reaches 160ºF / 70ºC, about 25 minutes.
Carefully remove the chicken from the grill and place it on a plate with a foil tent to rest for 10-15 minutes.
Cut the chicken into pieces, place on a serving platter, and serve with grilled vegetables.