Yes, You Can Order Extra Crispy McNuggets At McDonald's. But Is It Worth It? - Tasting Table

"Texture is one of the most important parts of any dish - especially chicken nuggets. McDonald's Chicken McNuggets aren't the best fast food nuggets, but they're plenty crispy. Still, if you ask for them well done, the workers may honor this special request. The process involves frying them a little longer, and the result is noticeable. But that doesn't necessarily mean you'll like it. Even though extra crispy McNuggets have some fans, others either don't see any difference or they think they're worse."

"Some feedback on videos that popularized this nugget hack indicate that not every McDonald's is willing to do this for you, so your mileage may vary. Even though the crunch is improved, some reviews also note that the taste falls short. YouTuber @shophocho7798 said, "although it is more crunchy, it tastes a little burnt. I prefer the regular." There are roughly 30 ingredient in a McDonald's McNugget to form that signature taste, so overcooking them may make them taste off."

"According to a McDonald's employee on Reddit, well done McNuggets aren't a very common request, "We only get 1-2 special requests for nuggets in a full 8 hour shift," they said. But they're also not a difficult one. The chain's workers simply put your nuggets in their own basket and cook them for an extra 30 seconds. Extra crispy nuggets look slightly darker than usual, but still golden brown. They also provide a noticeable crunch. If texture is your thing, it may be worth trying."

McDonald's will cook Chicken McNuggets well done on request by frying them about 30 seconds longer, producing a slightly darker, more noticeably crunchy exterior. Some customers appreciate the extra crunch while others report a slightly burnt or off taste from overcooking, possibly because of the many ingredients that create the signature flavor. Not all locations honor the request, and special requests for well done nuggets are uncommon. Frontline workers report only one to two such requests per eight-hour shift. Reactions to extra crispy nuggets are mixed; texture improves for some, while others find the change unnecessary.

Read at Tasting Table