Start by placing the chicken breasts between two sheets of baking paper and lightly pounding them so they’re even in thickness.
In a large bowl, mix olive oil, lemon juice, garlic powder, paprika, salt, pepper, and thyme.
Add the chicken to the bowl and coat it completely in the marinade. Let it rest for at least 30 minutes (or up to 4 hours in the fridge).
Heat your grill or grill pan to medium-high. Brush lightly with oil.
Place the chicken on the grill and cook for 5–6 minutes per side until the inside temperature reaches 75°C (165°F).
Transfer the chicken to a plate and rest for 5 minutes before slicing or serving.