1/2 c. shortening (I used butter)
1 c. regular oats or quick-cooking oats
1 c. flour
1/2 tsp. baking soda
1/4 tsp. salt
2-3 Tbsp. cold water
Preheat oven to 375 degrees Fahrenheit.  Cut shortening into oats, flour,
baking soda, and salt until mixture resembles fine crumbs.  Add water, 1
tablespoon at a time, until mixture forms a stiff dough.  Roll until 1/8"
thick on lightly floured surface.  Cut into 2-1/2" rounds or squares (I use
any ol' cookie cutter that's around at the time).  Place on ungreased baking
sheet.  Bake until oatcakes start to brown, about 12-15 minutes.  Cool on
wire rack.
I found that my oatcakes required several minutes more before they
started turning golden brown...possibly about 20-22 minutes.  After that
long mine are still wonderfully flaky, slightly crunchy, and YUMMY!  So I
would suggest you go by their browned state rather than the exact time.