Season chicken with salt and pepper; place in the melted butter. Cook chicken, flipping frequently, until browned, about 5 minutes. Sprinkle 1 tablespoon garlic powder over chicken; flip and sprinkle 1 tablespoon garlic powder on second side. Cook each side for 2 minutes.
Pour lemon juice over each side of chicken and cook until no longer pink in the center, 5 to 10 minutes more. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).