been too long since we had a pointless taxonomic dispute HERE'S A POWERPOINT ON WHY A QUESADILLA IS ACTUALLY A PIE
A pie is just a round rimmed mass of starch with a less-solid filling. It's why a pizza is a pie.
Of course, you could also argue that all pies are bread bowls.
Technically if there's no top crust it's a tart. No bottom crust is a cobbler, top and bottom is a pie.
