The breading you want for McNughies is actually more like a thin tempura batter. Full liquid bonkers. And the other secret is blanch em. Cook em at a slightly lower temp for a couple mins and put em on a rack. When it's dinner time, drop em for about 6 or 7 minutes.
I used a hand crank cast iron grinder that came from my grandmother. Big screw auger forcing product through the selected plate. I used the small one for nuggies and the biggun for cow.
Try coming up with a thin tempura that is gluten free and see how that works if there is a next time.
The other secret to nailing the McNughies flavor is the dippin sauces. They have always had great sauces in my opinion. I love the hot mustard, and it's super easy to make. Just use a brown mustard as a base, like Guldens, with a dot of dijon...maybe one fifth, a pinch of cayenne, a splash of white vinegar and brown sugar to taste....I like it just a dog sweet. It's an incredible sauce to know and is fucking phenomenal for grilled pork and chicken as both a mopping and a finishing sauce. Just use less sugar for the mop.
Look at me....we go from Chkn McNughies to mops and buckets. I'm cry.