I've been on this bread making kick. I don't know why. I make more bread than we can possibly eat. So I was looking at two, half eaten loaves and was like "darn it - I don't want to throw that away but it's going to go bad."
So I took a knife to them and cut them up in chunks.
Then I put the chunks on baking sheets. I baked for about 10 minutes at 300. Then I turned them over (or attempted to - I just sort of shuffled them around). After about 5 minutes, I threw my chunks in the food processor. Then I put the smaller chunks back on the cookie sheets and baked for another 10 minutes or so. Then I put them back into the food processor.
And VOILA! Homemade bread crumbs. Since I just ran out of bread crumbs, I just dumped my bread crumbs in the container. Oh - and at the second round of food processing, I added some oregano, garlic salt and basil. I don't know - maybe 2 tsp. or more of each. I'm liberal with spices. Mostly because I buy them at the Dollar Store.
You can do this with store bought bread. I was surprised at the ease of it. And I'm happy with the lack of waste. I shall make an epic meatloaf with my homemade bread crumbs made from homemade bread. I have become everything I have never wanted to be.