Hi Grace,
I had the original Nutribullet (I got it about a decade ago – and after about 5 years it made such a horrible noise when blending I had to retire it). I’m not sure if the one you have would make peanut butter. Thinking back, I don’t think the original one could, it put too much stress on the blades. If you have a food processor (I’ve had this one for almost a decade and it still works beautifully, it just looks well-loved now), that’s how I make all of my nut butters. You could use the same process as my cashew nut butter recipe. Hope this helps!
-Shawna

I’ve never actually made breadcrumbs before, but I don’t see why you wouldn’t be able to. Just make sure you’re using toasted or dry bread and chop it up enough to fit in the cup. I’d also suggest using the grinding blade, just like with making oat flour with it.
Hope that helps,
Shawna