Spray a baking pan or jelly roll pan with nonstick cooking spray.
Wash the chicken breasts and pat dry.
Combine the olive oil, oregano, mashed minced garlic, salt, and cayenne and black peppers. Stir to make a paste; spread some under the skin of the chicken and the rest over the skin.
Arrange on the baking sheet, skin side up. Roast for 35 minutes, or until they register about 165° in the thickest part of the meat without touching bone.