Used to be a manager, and thankfully left right before they brought back the Mexican Pizza...
That thing was / is torture to make, and always breaks or is put in the bag sideways (because it literally does not fit in the largest bag if you try and just place it in straight down).

The Nacho Fries comes in a close second though, but mostly because frying it essentially halved our capacity to fry literally anything else throughout the day.

Haven't worked there myself, but had friends who did and they showed me how to order a lot of shit they don't actually have on the menu anymore because they do still have all the necessary ingredients. Like the enchirito. They even still have green onions for it, which afaik is the only thing that ever used them.

Was a former employee. I remembered having a little difficulty making crunchwrap supremes due to the inner shell occasionally ripping the outer tortilla and the occasional fuckup when wrapping it and the fillings just fall out of it before placing it on the griddle. We collectively groaned when repeat customers in the drive thru order 2+ taco party packs.

My friend who used to work there told me her least favorite thing to make was the Mexican pizza because of all of the layers.

Never worked there but the Taco Bell subreddits were daily reads for me. I think the most consistently hated were basically any of the gimmick options, like the $1 Crunchwrap Sliders were my favorite food ever when they were around, but I was mortified to learn the employees HATED making them. A lot of the grilled stuff seems to be difficult. Nacho fries, though I don't remember why. I know ordering a bean burrito grilled was considered a douchebag move, but I think they removed the option to do that.

I'm not vegetarian, so not sure if you can modify to make it work for your dietary tastes. But my go to order is 2x 5 layer burrito, 1 nacho bell grande with extra cheese and guac, and cinna-twists.

Not a taco bell employee but a fellow vegetarian who loves tb. My favorite is a crunchwrap with refried beans instead of meat and their spicy potato soft tacos! Also a chalupa with black beans instead of meat.

You can sub anything with meat for beans! I've never been given a hard time but for all I know they completely hate me lol.

You can ask for "fresco style" and they'll sub any dairy for diced tomatoes to make it vegan.

My buddies son works there and hates to make the Cheesy Gordita Crunch because of the layers...