Are you referring to mixing the food to gradually make the switch from one to another?
Personally, I've never bought into that theory. In the very beginning, Teddy used to get slightly loose stools when I switched his food, yes. But I kept doing it. I'd wait a week or two until he was used to one food, then switch brands or flavors on him. I did it pretty rapidly for a few months while he was young. Now he doesn't get a stomach ache if I switch his food, just like you don't get a stomach ache if you eat chicken for dinner tonight and a hamburger for lunch tomorrow.
I don't feed raw myself. I tried pre-made raw (Instinct) but Teddy didn't like it.

So I can't help as far as recipes.
I don't think that they need to get the entire chicken breast into their mouth. From what I've read, you usually start with chicken or turkey necks and wings. Those bones are much smaller and chewing on the bones really helps with teeth.
Also.. I can recommend a good enzyme dental spray if you're interested. It's called Leba III and it's sold on Amazon.com and GWLittle.com for around $50. Works great and lasts a long time. Just two sprays a day without food or water 30 minutes before and after each spray. It works wonders.
Here's how his teeth look while using the Leba spray consistently:
Here's how they look (today) since I ran out of the spray two weeks ago:
You can see how the top of his canines is turning yellow again. His breath has also been much more sour.