Finely chopped fresh herbsto taste (my favorite is fresh dill) (see note)
Position the top rack about 3"-4" from the heating element. Set the oven to broil and let it preheat on high.
Line a baking tray with foil.
Carefully slice the chicken breasts in half lengthwise. Spread on the baking tray. Rub each piece with a tiny amount of olive oil, about 1/2 teaspoon per half-breast, then sprinkle salt, pepper, cayenne, herbs and minced garlic. Pat to make sure the seasonings stick.
Broil the breasts for about 3-5 minutes per side, until nicely browned and the internal temperature reads 165F. The broiling time will vary depending on the oven and the power of the heating element, proximity to the heating element, etc. Pay close attention to the chicken at all times as it will only need minutes to cook.
Do not use dry herbs, they burn easily. I've had success using fresh dill and use it every time. You may skip the herbs altogether. There will be plenty of flavor from the roasted garlic.