Preheat the oven to 400ºF and drizzle the olive oil onto a rimmed baking sheet. Add the chicken breasts to the pan and flip them over so both sides of the chicken are coated in the olive oil.

In a small bowl, combine the salt, garlic powder, paprika, and pepper. Stir well to mix, then sprinkle half of the mixture over the top of the breasts. Rub the spices into the chicken, then flip them over and sprinkle the remaining half of the spices evenly over the other side of the chicken and rub them into each breast.

Place the pan in the oven to bake for 20 minutes at 400ºF. When the timer goes off, test the chicken for doneness using a meat thermometer. Small chicken breasts could be done cooking at this time, but most chicken breasts will need a few more minutes depending on their thickness. (1-inch breasts will be done in roughly 20 minutes and 1.5-inch breasts will be done in closer to 25 minutes total.) The internal temperature should reach at least 160ºF before removing the chicken from the oven. Flip the breasts over and continue to cook for 3 to 5 more minutes, or until they reach that internal temperature.

Let the chicken breasts rest on the pan for 5 to 10 minutes after removing them from the oven. They will continue to cook and reach the safe internal temperature of 165ºF. Then they are ready to slice and serve. Leftover chicken can be stored in an airtight container in the fridge for 3 to 4 days.