Here's one I use all the time. It's quick, cheap and easy and the dogs go berserk over it:
1 container of chicken livers
1 egg
puree in blender and pour into mixing bowl
Add 2 cups oat flour (or any flour) and mix
(I sprinkle a little fresh parmessan cheese on top or mix right in)
Pour into greased 8x8 baking dish and bake in pre-heated 350 degree F. oven for about 30 minutes, or until edge pull away from sides.
Cut into as tiny pieces as you can and cool. Training treats need not be any bigger than about the size of a pea. You can freeze in baggies.