The phrase "crusty bits" refers to small pieces or areas of food that have become dry, hard, or crispy. It can also be used metaphorically to describe small, annoying, or troublesome aspects of a situation or person. Full definition
- Give the oatmeal a good stir, making sure to get all the delicious crusty bits off the sides of the slow cooker (they looks scary, but taste delicious). (domesticate-me.com)
And those charred crusty bits on your barbequed ribs? (sciencemag.org)
Remove crusty bits from the eyes to avoid blockages in the tear ducts (this is obvious, but be very gentle and careful not to accidentally poke your bunny in the eye!). (boingonline.com)