I use the same basic skeleton for pretty much all my treats:
Main meat (beef, liver, tuna, salmon, etc)
barley, oat, or chickpea flour
-If I want to make something with no grains for my allergy dogs, I'll boil sweet potatoes until they're soft and mash them up to use, or I'll use something like chickpea flour.
But basically, I throw my meat ingredient and egg(s) into the bowl and mix it up and then mix in about a half cup of flour/potato/whatever at a time until I get a doughy consistency that's pulling away from the sides of the bowl.
I grease up a cookie sheet, press the mixture into the sheet from edge to edge and then bake at 350 at intervals of 30 minutes - bake, cool, check, bake, cool, check. It usually only takes two or three blasts in the oven before they're nice and firm.
If I have a larger batch, I just judge when they're done based on how firm and springy they feel after the pan has cooled off. Then I can just use a pizza cutter to slice off tons of little training treats.
Garlic is only dangerous to dogs in very large amounts. I will sometimes add a tiny bit of garlic to the treats to give them a unique smell, but only one in about every five batches I make has garlic and it only takes about half a teaspoon of dried garlic to be something for my dogs to get fired up about.
I mostly like this recipe because it's one of the easiest ways for me to just pick up canned tuna, sardine, turkey, whatever that's on sale at the grocery store and have quick cheap treats. It's also very easy to modify. Want a tuna and cheese treat? Throw in a handful of shredded cheese. Want a peanut butter and ham treat? Mix a big ol' glob of PB in there! It can be fun testing out which combinations hit the money