Coming in here to scream Croque Monsieur from the rooftops and then leave
… Nah but seriously, the Croque Monsieur is a ridiculously good sandwich. Even cheap ones. Honestly, during my year abroad in France, any time I was having a shitty day I would just stop at the nearest available bakery and buy a Croque Monsieur. Typically they would be somewhere between 1 and 2 euros, piping hot, warm and cheesy. They singlehandedly got me through that winter.