Once upon a time, a long long time ago, I was reading "How to Eat" by Nigella Lawson. In it, she talks at length about how to make all sorts of things; and this was waaay before the current "make your own ketchup" times we live in now. I discovered that it is ridiculously easy to make your own breadcrumbs (and actually know exactly what's in there, instead of scary pre-fab ingredients). Here is what you do.
Get some slightly stale bread. Make sure it is not moldy. You can even just do the bread end pieces if you want. Cut them into large squares.
Set the bread crumbs out in a pan, on a cookie sheet, cutting board, what have you. Somewhere that they are spread out a bit, and not crowded.
Leave them there for a couple of days, until they are dried out and hard.
Store in the freezer until you are ready to use them; then you can keep them in large pieces (like if you're making stuffing) or blend them up in a food processor (if you want bread dust for coating something, or to put in a recipe).
There you go!