Step #1 Combine the first 5 ingredients with an electric mixer.
Step #2 Add the oats & as much of the flour as you can until the dough is too hard to mix.
Step #3 Turn dough out onto a floured surface & knead in the remaining flour.
Step #4 Dough should be stiff, but not crumbly.
Step #5 Roll out dough about 1/2-inch thick & cut into desired shapes with cookie cutters, or for a quicker version just cut 1/2-inch wide strips with a pizza cutter or knife, & then cut strips to 2-inch lengths.
Step #6 Place on ungreased cookie sheets & bake this at 325°F for 20 mins.
Step #7 Turn biscuits over & bake another 20 mins.
Step #8 Turn off oven & open door so it's ajar to let out excess heat for a few mins & then close door & leave biscuits in oven until all the heat is gone.
Step #9 If there is still moisture in the biscuits, let them air-dry until they are completely hard & crisp before storing.