Pat chicken breasts dry with paper towels
Pound to even thickness if needed
Season both sides with salt and pepper
Heat a skillet over medium-high heat
Add a small amount of oil or butter
Place chicken breasts in the hot skillet
Cook without moving until browned on the first side
Flip and cook the other side until browned
Reduce heat if needed to prevent burning
Cook until the internal temperature reaches 165°F
Remove from the skillet
Rest for a few minutes before slicing