Preheat the oven to 400°F (205°C)
Line a baking sheet with parchment paper or lightly grease it
Pat the boneless chicken breasts dry with paper towels
Pound the chicken breasts to an even thickness if needed
Brush or rub the chicken with oil
Season both sides with salt, pepper, and any desired spices
Place the chicken breasts on the prepared baking sheet
Bake for 18 to 25 minutes, depending on thickness
Check that the internal temperature reaches 165°F (74°C)
Remove the chicken from the oven
Let it rest for 5 to 10 minutes before slicing or serving