WOW, What timeing our 4-H club sells homemade treats as a fundraiser which we just did this past weekend. If you do a search on "easy homemade horse treats",that is how we get most of our recipes. I did 2 different kinds this year. The easier one;
3 cups oatmeal
3 cups bran
1/4 cup sweet[optional]
2 cups molassases
add water to make a doughy consistancy-depends on grain used
food color if desired
shape into- I used easter cookie cutters, small balls, and rectangle candy bar shaped by hand
apprx 1/2" thick
bake @ 350 5-7 minutes
Horses loved them,

but so did the kids