Superman: The Animated Series (1996-99); If fading memory serves, I believe Clark was visiting his parents and while in the bathroom preparing for his day, he used his reflected heat vision to burn off the stubble on his face.
The bathroom mirror had to be 100% reflective, which I didn’t think was possible, at least in our reality.
Luckily I checked before commenting, but I had my eye on a Lara Trump sex doll (growl)…