I adore a good chicken nugget, but there can be a fine line between "perfectly golden brown" and "burnt". This official "Crispy Chicken Filet Colour Guide" from Burger King is the chart you've been looking for.
The photo below was snapped by Helen Rosner at Eater. Apparently, a careless employee at a US Burger King chain left it on the counter. Now we call get to follow their simple instructions:
Bless whoever left this glorious document face-up on the counter at this rest stop Burger King pic.twitter.com/1dUmUXKEjz
— Helen Rosner (@hels) April 10, 2017
As you can see, the chart clearly answers the question "should I use this chicken?", letting the chart-user cook perfectly crisp, but not burnt, chicken nuggets, strips and patties. Now that the chart is no longer a closely-guarded BK secret, you are free to print out Helen's tweet, and put it up on the fridge for easy reference.