"Pat ate her bishop's bread...made from a recipe Judy had brought from Australia and would never give to anyone.  She had promised to will it to Pat, however."
-Pat of Silver Bush, Chapter 16.

2 1/2 cup flour
2 cup brown sugar
1/2 cup butter
1/2 tsp baking soda
1 egg
1/2 tsp salt
1 tsp baking powder
1 tsp cinnamon
3/4 cup sour milk

Add sugar to flour. Cut in shortening. Reserve 3/4 cup mixture for topping. To remainder, add baking powder, soda, cinnamon, egg, sour milk and beat until smooth.  Pour into 13X9 inch cake pan (greased and floured) and sprinkle with crumbs and additional cinnamon. Bake at 400F for 25 minutes.

Thanks to ParkCornerPEI for the reference and recipe.