Preheat the oven to 425°F (220°C) or 200°C if using a fan-forced setting.
Flatten the chicken breasts to a uniform thickness of approximately 1.5cm (0.6 inches) using a meat mallet, rolling pin, or your hand to ensure even cooking.
Combine all the seasoning ingredients in a small bowl.
Line a baking tray with foil and a sheet of parchment paper. Position the chicken breasts smooth side down on the tray. Drizzle with 1 teaspoon of olive oil, then use your fingers to coat the surface evenly. Distribute half of the seasoning blend across the exposed side.
Turn the chicken over. Drizzle the remaining olive oil and again use your fingers to rub it in. Apply the rest of the seasoning, ensuring complete coverage.
Place the tray in the oven and bake for 18 minutes, or until the surface is golden and a thermometer inserted into the thickest part reads 165°F (75°C).
Once done, remove the chicken from the oven and immediately transfer it to serving plates.
Allow the meat to rest for 3 to 5 minutes before serving. Sprinkle with chopped parsley if desired.