Preheat the oven to 425°F (220°C) and line a baking tray with foil and parchment paper.
Pound chicken breasts to about 1.5 cm thick at the thickest part for even cooking.
In a small bowl, mix the brown sugar, paprika, oregano, garlic powder, salt, and pepper.
Place chicken upside down on the tray, drizzle with 1 teaspoon olive oil, rub it in, and sprinkle with half the seasoning.
Flip chicken over, repeat with remaining oil and seasoning, coating as evenly as possible.
Bake for about 18 minutes, until the surface is golden and the internal temperature hits 165°F (75°C).
Transfer chicken to plates and let it rest 3–5 minutes before serving, adding parsley if you’re feeling fancy.