I used a combination of light and dark meat chicken, that I poached gently (bone-in, skin-on) until it was just done, and then let cool. Really, you could use any type of meat your cat likes; beef, turkey, white fish, tuna, salmon, duck—they're all good options. I like to use meat that I've cooked myself, so that there is no added salt or seasoning. Too much salt can be poisonous to cats, as can onion and garlic. Better to play it safe than sorry.
Originally I was going to add a little spinach to the mix, but in typical form, I forgot to set some aside when I made spinach for dinner a couple nights before I made the treats (even though I originally bought it with the treats in mind). So, I'll have to put it in a future batch.
