Best treats for destructive weenies?

My dachshund is 3 years old. I’ve known he has separation anxiety, and for a long time he was better with it. No more accidents inside or torn up stuff.

Well, over the last 2 weeks this has started to change. He’s breaking into rooms that we have closed off for our cats with door jammers and tearing stuff up. I don’t know what has caused the sudden shift back, but I’m starting to get frustrated. I’m about to start a new job and can’t worry about him all day.

So, my solution is to start putting him in a crate again when I leave.

But I was wondering if anyone had any good treats that I can give him in the crate that he can take his anger out on instead of my house lol

TLDR: Good treats for dogs that are destructive and tear through things quickly?