I have a zip type bag in my freezer that I put in the ends of loaves of bread that go uneaten, stale bread, the crumbs at the bottom of corn flakes or other non sweetened cereals bags, broken crackers, etc. When I have the time, I run them through my food processor, and then return the bag of crumbs to the freezer for the next recipe that calls for them. I haven't bought crumbs in years.
I don't toast them. In any case when I mix them into a casserole they get wet.Maybe toasting would add a certain flavour, but it is an extra step that I might put off and end up not doing it in time and the bread would get moldy.
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